Which Vaporeon?

If you like dodging AT is the best. And like you said you can also toss it in a gym.

I always used to go with the sheer power of HP and its not a bad option but we have so many Rhydons in gyms here I prefer AT. I can get off an AT in between Ryhdons attacks and not miss a dodge.

It allows me to easily go through multiple Rhydons with taking minimal damage. With HP you are going to take more damage and use more potions but it will go faster.

I think AT is very underrated for attacking, especially for people who dodge everything like myself.

Ok so with AT you are right they are great defenders with high hp and cp but AT variants really lack in the ability to be a generalist... Because I use my HP variant at 2130 to take out blisseys as high as 2700 but there is only like 8-20 seconds left at the end but he can do it but the AT ones on the other hand can't so I would say do two to have a defender and an attacker.

I would not power up any of those...Just evolve ANY random high level Eevee and hope for a Vaporeon.

This depends on your gym area, but it'd be a waste of dust and candies to power up lower IV Vaps since Vaps are not really seen in gyms anymore in my area (unless the trainer is pushing 38+) and as an attacker, any high level Vap will do...HP or AT both work fine. I have an army of them, all not powered up.

personally I would save your stardust none of those ivs are high enough for me.
If you are really desperate for a water attacker such as vap, just find the strongest eevee you can in the wild and evolve it until you get vap. You might waste some eevee candies but those aren't exactly hard to come by. this will keep you set for attacking for a while until you find ~the one~

I like aqua tale, it fits between rhydon quick attacks.
80% don't sounds like a viable defender, especially for vaporeon. And level is too low as well

Wait for a 5k Eevee hatch that guarantees good IV and hope for your best for a HP Vaporeon.

They are a great investment and I have 5 at level 30.

HP ones wreck everything. My go to choice for any gym composition with Rhydon/Tyranitar.

AT ones are better for Rhydon but worse for Tyranitar.

Water Pulse ones...Rubbish compared to the other two...but I use them after my HP ones and AT ones faint.

Do you have an HP Gyarados though? That is very much a usable substitute.

as several above unless the
iv > 65 CP ~2500
iv > 80 CP > ~2000
iv > 90 CP > ~1500
iv > 95 CP > ~1000
iv 100% any Cp (98% maybe)
and aqua tail or hydropump

Delete all others

you'll eventually have a collection and wonder why you spent so much dust on stuff you'll eventually be throwing out

If you're looking for an attacker, then either of the AT ones will do quite well. Ignore everyone saying the IVs are too low. I have a HP vape at level 30 with IVs below 80% and he does just fine. The one you have with HP is really low level and would probably require too much dust to be worthwhile.

i'm surprised these are your best vapes as they are pretty common - quite honestly i'd not level a single one (or even appraise any eevee below 700cp) and i suspect you've been wasting candy powering up when a decent or even not very good IV catch evolved would be better cp in the short term (attack or def).

of the 3 you mention keep #3 perhaps to level up but bear in mind what i say above, and #1 has the hallmarks of a good 1200cp prestiger but there is no way you want to go higher - i assume you are at least player lv.30 so bad luck or not focus your candy on evolving high level eevees before chasing top IV's/moves.

If you have enough candies to make #3 gym viable, go for it. Things depend on what your local gym scene is like, but I've hidden enough OK Vapes ahead of Blisseys to keep me in coin for a long while. I'd take #1 up to 1000 cp as a prestiger. If your main purpose is to get an attacker, keep evolving any higher IV, higher level Eevee you can until it falls into your lap.