Snorlax

I powered up my 69% BAA with ZH/HB, he's a great defender. HB is just really easy to dodge.

I say power up the 89%. Earthquake isn't the best move, but since you want a defender, IV is more important than moveset. Unless you are constantly hatching eggs or you are sure that you'll get a higher IV Snorlax with a better moveset, just power up the 89%, even with the less than ideal moves.

Gregoire,

Don't just look at the IVs, check out each mons max cp potential. Just basing your decision on IVs can be misleading.
My 67 IV snorlax has a higher Max CP than my 80 IV snorlax.
My 67 also has ZH/BS, my 80 has ZH/HB.
Guess which one I'm powering up first? Yup the 67 IV one.

I don't know what you mean about having enough candy to power one up, but unless you have enough to take one all the way up to level 33 or so, I would do one of two things:

1. Power up the L/HB to CP 2300-2400 or so, for use as an attacker. I know you say you have enough attackers, but do you have a Snorlax attacker? It's essentially like a super Wigglytuff, and can fill the same generalist niche that Wiggly does for prestiging. In other words, use it as your sixth attacker to handle any defender when your specialists falter sooner than expected. L/HB Snorlax is actually a very fun and reliable attacker to use against almost anything.
2. Save your candies until you have enough to power up the ZH/EQ to a level that will get a decent spot in high-level gyms (level 33+ in my area). You just might hatch a better one (say, ZH/HS, or higher IV's) in the meantime.