plz help to choose the best snorlax

The first one for offense, second one for defense.

All candy into the first until it costs 5candy per powerup. #1 is an amazing attacker and solid defender.

2 is the ideal defender but will take a bunch more powerups and is a mediocre attacker.

So yeah hands down #1 unless you already have an amazing assortment of attackers which it sounds like you don't.

The first two are great attacker and defender respectively. I prioritize investing candies in defenders, as they need to stand in the higher tier possible in gyms to be safe and to be a deterrent for possible attackers. If you learned to dodge effectively the first snorlax would do great as is.
So, I would power up the second one, the first after having reached lev 30 with the first. The third is a perfect buddy;)

Power up 1, safe 2 for when you still have many candies and dust for it is the best defensive moveset and transfer 3.