Which Snorlax Power Up?

Assuming it's as a defender - ZH/HB. Small amount of candy/dust saved and better moveset - the IVs will make minimal difference.

ZenHead for sure

if you use that for attacking pick which is for you more comfortable to use. for me lick and beam

Zh/Hb for defense for sure

L/HB for if u want an attacker Snorlax and ZH/HB if u want a defender Panda..

HB easiest move in the game to dodge so I would invest in the one with the better iv.

The answer is almost always the ZH, if you (or anyone) are asking the question.