>>29619640To me it is the best Vaporeon possible.
In terms of Damage per energy it causes as much damage as HP with a little less damage per second but with HP you probably will have many situations when you refrain of using it waiting the opponent to use its charge attack first so you can dodge it so HP end up with a lower damage per second than AT unless you charge it and use it right away not caring about damage received while AT you can charge one bar and shoot it right away before the enemy have time to charge a more powerful attack them you can wait the opponent to use its charge attack, dodge it and use it again on it.
In the defense both AP and HP the enemy Vaporeon will stay still before initiating the attack animation while AT there is just a little jump as warning so in practice you have less time to prepare yourself against a vaporeon with AT.