This choice majorly depends on the student and his preferences. 

Seth GS:

• If you prefer studying a lot probably most of the time then opt for Seth GS. 
• They have a highly qualified staff and caters to KEM Hospital. 
• You will be studying amongst some of the brightest minds. 
• The hostel and accomodation facilities are the only problem, due to its location.

GMC:

• If you want to enjoy your college life, Grant Medical College (GMC) will be good for you. 
• It has the largest campus in Maharashtra. 
• GMC conducts the best cultural fests and events, be it sports, art or academics. This provides great exposure. 
• The staff here is also highly qualified just like KEM. 
• Students here tend to lean towards the extracurricular activities more than the studies. 
• The campus has 2 boys hostels and 1 girls hostel enough to provide lodging for all the students who apply. 
• The hostel provides facilities like hot water, pure drinking water, beds, tables, etc. 

Most people will claim that KEM is better for your career. But at the end of the day you also need some extracurricular activities to engage in and avoid the monotony.

GMC Mumbai and GSMC have always been compared to each other. 

GSMC has great academics and a very competitive environment. GMC is much more relaxed. At GMC, you’ll come across a variety of students- from nerds to all-rounders, to those who study the night before an exam. 

Toppers generally choose GSMC as their first preference. But those who spend some time in Grant, usually refuse to be upgraded to GSMC. Grant students are better at extracurriculars, while GSMC students are on average, more studious.

Both are good for an MBBS degree. You should choose between them based on your personal preference.

The sole reason many medical aspirants choose Seth GS for MBBS over GMC Mumbai is the quality of education it offers which places it somewhat higher than GMC. 

Grant Medical College is indeed a well-known medical college but not yet at par with KEM at least in terms of academics. KEM welcomes the best student crowd and churns out many great doctors. 

Seth GS on the other hand is at the same level as the top medical colleges of India, AIIMS and JIPMER in terms of academics. However, it’s yet to match its level of infrastructure, clinical exposure, and research opportunities.

Grant is known to have very old infrastructure, with issues related to internal politics and corruption. However, most ranking magazines place GMC over Seth GS thereby misleading many.

So always consider all the aspects before choosing your college. 

Trust me there is no right answer to your question as the choice of the institute is a matter of personal inclinations and goals. However here are a few points you would like to consider before selecting your college

• Academically, the quality of education and the research facilities available are similar in all the aforementioned institutes and so you choosing one over the other will not compromise your education.
• The primary factor should be location. Here there are 2 things to consider proximity to your home and the kind of college life you want. If you want a tranquil and calm life go for AIMS Rishikesh but if you are a city lover, go for Seth GS.
• Infrastructure-wise, AIIMS definitely gives an edge to Seth GS. The modern campus, with top-notch equipment and hostel facilities, offers a more comfortable and modern college life than an old institute like Seth GS. 
• Being a central institute, AIIMS offers more exposure to diverse cultures and a mixed student body.
• AIIMS Rishikesh follows a total MCQ exam pattern making it easier for NEET PG preparation. 
• The most lucrative aspect of AIIMS is the tag associated with it. You will forever be honored for being a part of an institute of national importance.
• There is no bond policy in AIIMSwhereas Seth GS has one.

Now it depends on you to decide which factor attracts you and which factor you are ready to overlook. Once you have weighed all points only then you can arrive at a wise decision.

Based on the opinions within the medical community, I will provide some information on these colleges-

1. GSMC- It is a highly renowned college. High rankers in UG and PG entrance choose it for pursuing their medical studies. Clinical teaching is very good over here. 
2. Grant Medical College Mumbai- It is one of the top 10 medical colleges of India. But its fees have skyrocketed recently. The campus is not in a good shape too. However, this college is one of the only 5 colleges whose degrees are approved in Singapore. So if you plan to pursue your PG abroad, a degree from GMC Mumbai will open the doors of Singapore for you.
3. KGMU- It is one of the best medical colleges in North India, and especially UP. It is well reputed, and the campus is really good. The infrastructure is top notch, better than most government colleges. The teachers are decent, and the students are hardworking. You’ll get a good clinical exposure over here. For an outsider though, adjusting to the UP culture might be a little difficult at first.

I don’t know much about GMC Patiala and GMCH Chandigarh, so I won’t comment on these two. 

Make sure to choose a college with hardworking students. Good company will motivate you to study harder and excel in your field. Food and language barriers aren’t much of a problem in the long run. 

Here are a few parameters to compare GMC Mumbai and VMMC-

• Location- Both the cities are top-tier, but I would suggest going for Delhi. It offers better PG coaching facilities.

• Internal Reservation- VMMC offers internal PG reservations, whereas GMC does not. 

• Clinical Exposure and Faculty- VMMC offers much better clinical exposure and faculty.

• Paraclinical Academics- In this regard, GMC is much better than VMMC.

• Close to hometown- If you are a North Indian, VMMC will be much more accessible from your hometown.

• Brand Value- Both the colleges have equal brand value.

• Hostel facilities and campus culture- In this regard, VMMC is a better choice. 

Both GMC Mumbai and VMMC are good institutions. However, VMMC is a better choice according to me.