Hi

Here I'll give a brief comparison between two of these exams

TIFR GS

This exam is conducted on the first week of December

IIT JAM

This exam is conducted on the first week of February

now TIFR GS is a little harder here due to its timing. Because most of us have their semester exams on December or November so preparing for TIFR GS along with semester exams is difficult.On the other hand IITJAM has a quite good timing. Because the even semester starts on May .

Now TIFR GS is conceptual exam.

IIT JAM is formula based exam.

So here if you have a clear concept but you don't memorize formulae TIFR GS would be easy for you.

But if your subject knowledge is not that good but you practice a lot and have memorized every formulae IITJAM is easy for you.

Another thing is that TIFR GS is a two stage exam .You have to give written exam and interview.But IIT JAM is only an  exam of 3 hrs.

So these are the pros and cons .

Hope this helps