What should I evolve my Eevee into in platinum?

AKA, which strat is better?

Jolteon with Rain dance + thunder
or
Vaporeon with lots of health, acid armor, and aqua ring

I've used both in the past, and can say I'm satisfied with either...

other issues...
I already have a psyduck on my team, so if I got with Vaporeon, I'll have to find a replacement for it. (I'm very picky with types on my team...no 2 of the same type allowed)
If so, do you have any suggestions for a replacement?
my current team is as follows:
Combee
Buneary
Psyduck
Turtwig
Ponyta

and eevee when I get it.
again, avoid double types.

thanks in advance

lol, thanks for the help guys.
Went with Vaporeon for IDK.
Pikachu will be "sub".