Which Snorlax should I power up?

I would go with either 2nd one or 3rd one. THe first one is an offensive moveset but in my opinion Snorlax is purely a defensive one. He is too underwhelming on offense.

The 2nd move is perfect for defense. The third snorlax has a great defensive charge move but lick isn't good for defense. But since its 95% it will have a massive CP when maxed out so that's a big positive when considering defensive mons.

I would prefer L/BS for attack over L/HB. HB is rated higher because it does do more damage over time but only if you're using HB whenever it's available.

If you dodge, BS doesn't waste energy since you can use it and still be able to dodge defending quick moves, so you'll end up doing more DPS than if you had Hyper Beam but still spamming Lick at 100 energy because you're waiting for the opponent to use their charge move.

L/BS also has higher IVs but even if it didn't, I'd still personally power it up of the 3. Gyms don't get trained up where I am so I just place cannon fodder to collect coins and transfer when they faint, rather than place a good pokemon that's "good" at defending and still have it faint half an hour later.

Your third one is the best imo, although it will cost you more dust and candy. In the end you will have the highest CP snorlax and the best moveset for attacking purpose.

Easy choice to start:

Snorlax - 2200 CP
82.2-84.4% IV
14/13/10 (82.2%) lvl 23.5
14/12/12 (84.4%) lvl 23.5
Moveset: ZH/BS

Max him out!. Its a beast, mine are 2979cp now (3000+ tomorrow) with the same moveset and 93.3% IVs. Just awesome.

2 and it's not even close. The difference between Lick/Body Slam and Zen/Body Slam is over 2 dps once you power them up. (as a defender) The few CP you give up is well worth it, as #2 is beast and #3 is more of a glass house.