Comparably NEIGRIHMS is better. However, both of these two institutes have their advantages. 

NEIGRIHMS: 

• It has a virtual dissection table. Other than one or two medical colleges, you can’t find this facility anywhere in India.
• As their student intake is not high, the student-teacher ratio is better. You will get more personal attention from teachers. 
• The campus is clean and quite beautiful.
• The internship salary is more. 

GMC: 

• It has more faculty.
• You will have access to PG coaching centers like Dams. As it is situated near the college.
•  It also offers better exposure. 

NEIGRIHMS has improved a lot in a very short time. The healthcare quality offered on campus can’t be compared to anywhere else. 

I am a student of Medical College Kolkata, so I’ll try to justify joining this college for your MBBS-

1. It is an old college with a great faculty. 
2. The competition is quite high over here, so you’ll need to work really hard.
3. The hospital sees a lot of patients daily, so you’ll get great exposure.
4. The college street has ‘Boipara’ i.e. a street of books. Over here, you’ll find all the required books. Across the street, there is a stall that offers books at a good discounted rate.
5. MCK is a brand in itself, and a dream of many medical aspirants.
6. The seniors are very helpful and supportive. They will help you from the very start of your MBBS journey. 

NEIGRIHMS is a good college as well.But being an alumnus of KMC, I would encourage you to consider this college for your medical studies.

Both GMC and NEIGRIHMS have their own pros and cons. I am listing down the advantages of both-

GMC 

1. It has more faculty. 
2. PG coaching centers like DAMS are located near the college itself.
3. It takes more students. 
4. It is located near the airport.
5. It offers better exposure.

NEIGRIHMS 

1. It is one of the few Indian colleges with a virtual dissection table. 
2. It is high because it takes just 50 MBBS students every year.
3. Its campus is clean and beautiful.
4. Personal attention is given to each of the students by their teachers.

Both GMC and NEIGRIHMS are good medical colleges. You should choose between them based on your own preferences. 

I belong to Silchar and pursued my MBBS from NEIGRIHMS. This makes me qualified to talk about both. Here are some details on both these institutions-

NEIGRIHMS:

1. It is a central government institute with a state-of-the-art infrastructure. The MBBS faculty is well experienced and dedicated, though less in number. 
2. After completing your UG from this institute, you’ll be well-equipped with knowledge. 
3. Alumni from NEIGRIHMS go on to other prestigious institutions for their PGs. The hospital has a huge patient load, with cases coming in from all across the North East. So as a UG student, you’ll be at a surplus of cases. 
4. The climate and people of Shillong are both really good. The college campus is beautiful. It is the cleanest of all medical colleges in India.

SMC:

1. SMC is an old institute located in Assam. It has a huge alumni network, having been an alma mater to numerous successful medicos. 
2. But like other state government institutions, you’ll learn mostly from the PGs and your seniors. It has a lot more PG students than NEIGRIHMS where PG courses are at an infant stage. The seniors are friendly. 
3. The faculty is less in number. The patient load is high, and residents have to work a lot. But it is one of the worst-maintained medical colleges in terms of cleanliness. 

If you are a domicile of Assam, it is better to do your MBBS from SMC. After your graduation, go for rural posting. After all this, you’ll become eligible for state PG quota. NEIGRIHMS has a very high competition for PG seats, and getting in for a UR student is especially difficult. 

Both are equally good colleges, and you should choose between them based on your own preferences.