Generally speaking
The 62/64gr stuff is expands, is barrier blind, retains its weight, and is more consistent.
The 75/77gr stuff delivers more energy, is (often) more accurate, and carries its energy a longer distance (better BC). "When" it fragments, it is more devastating, but consistent fragmentation isn't always a thing (except for the TMK)'s.
Look at it like this:
The 75/77gr BTHP, OTM's, and SMK's are basically bigger, better versions of M193 (hence Mk262). 77gr TMK's are basically, bigger better versions of 55gr V-max.
The FBI uses the 62/64gr stuff.
What is "better" is a Coke/Pepsi thing.
I got into 75gr Frontier and 77gr IMI because of the carried energy, and at the time, the super cheap price from Midway.
I'm sure a bunch of folks got into 62/64gr Gold Dots (or Fusion, can't remember) because PSA was running them on clearance for cheap.
Edit: This is arfcom. Get both. Shoot what your barrel likes best, and/or what is best on your wallet.