A 6 year old 4 threaded i3 vs a fairly current 2 threaded Pentium ??
They're really too hard to compare mate , the pentium has better single core performance , the i3 has 2 extra threads.
Neither are great choices at all , finding a decent board for the old i3 will be a pita , the newer Pentium will let you down in games that are heavily multi-threaded.
You should be looking at the pentium g4560 which is the best of both world's & is cheap, the only issue being that b250 boards aren't.
Assuming you're in India ?? A g4560 & a decent board is around 11000 inr.