MJ-872 led replace advice needed

Hello.

I have MJ872 with XP-G onboard.
I compared that to my friend’s Nitefighter bt40s with XP-G2 and mine is not as much bright as his.

The plan is to replace emiters. I can use XP-G2 S3 3D or Nicha 291C.

I need to buy those anyway so the question is: which one are worth to use and why?
I can tweak current on driver too if needed.

Tia, Mike