There's not a lot in it really, maybe 3-4 degrees C between the worst and the best pastes. Just use what you have, buying something else won't make a jot of difference.
Saying that I tried something new to me when I rebuilt my pc into it's new case last week and I now have a genuine Honeywell PTM7950 pad on my 7800x3d. It's on par with the Kryonaut I used previously but what a pain to use!!
