Comparitively IHM Hajipur is best college than IHM Gawhati. Mainly in placement and cut-off. Below information shows you the difference between this two colleges.

IHM Hajipur is good.

Placements: Almost eligible students will get placed their. The top recruiting companies are Leela, the Oberoi, Taj, ITC. The top roles offered are B.Sc in hospitality and hotel administration. The highest salary package offered is 4.0 LPA, the lowest salary package offered is 1.75 LPA, and the average salary package offered is 2.5 LPA.

Infrastructure: In this college, the classrooms have a hi-tech projector, air-conditioner, 24/7 lights. In college campus, Wi-Fi, one computer lab is available, and the library is fully automated with air-conditioning. The hostel had a large mess, and according to the menu, they will provide the food.

Faculty: The faculty of this college is good. Institute of Hotel Management and Catering Technology is very helpful, qualified and well knowledgeable and had experience in their respective departments. Also encourages extracurricular activities such as sports, singing, dancing guitar etc.

IHM Gawhati is also good.

Placement: Around 60-80% students placed.The highest salary package offered is 3.5 LPA, the lowest salary package offered is 1.5 LPA, and the average salary package offered is 2 LPA.

Infrastructure: There are 3 cookery kitchen and 2 bakery kitchen, 2 restaurant, 2 computer lab, 1 library full of our courses related books, 1 conference room, 1 multipurpose hall and 1 auditorium in the college premises. The whole campus is decorated with a beautiful garden, and there is also a cricket ground for the students

Faculty: Our teaching facilities are very helpful, and they provide notes, handouts, PDF in the class, and they teach us the whole syllabus in the projector so that the students can learn easily. In the library, we get every helpful book.

IHM GUWAHATI 

IHM guwahati is a below average college because of cut off. This year cutoff is around 13k and the total student apear in all india exam is 22k(approx) so it'd be easy to take admission.

• Infrastructure is excellent
• Placement mostly in chain stores and quite less in hotels
• They do not disclose faculties experience and education so can't say but I don't think so you'd get aggood faculties as you can see the result quite poor.
• Crowd: You can easily guess.

Verdict: 'kahi nhi mila to yaha mil jayega'.

BTW If you choose this college:
Studying in IHMs is very tough than other private HM institutes. IHMs make their student strong for hotel industry. 
Hotel's top priority is to recruit IHM students, so guwahati has number of 5/4 star hotels so their top priority to selct IHM students.

Go ahead and do it with passion and try to be a brilliant student

This was review of a friend who is studying there and as far as IHM hajipur is concerned its also on same page as Guwahati  so its, 

Very difficult to comment on any specific college, please check their level and scoring on placements and also note the Central recognized college should be firstly preferred