I have always favored Jolteon over Vaporeon. I have always thought that Vaporeon was ugly because of it's head thing. /forgetting what it is callleeddd....
I also have a Jolteon doll.
On my Diamond, /R.I.P D:/ , I had all the eevolutions. I always used my Jolteon, Umbreon, and Espeon. The first time I got eevolutions was Pokemon Coliseum, Umbreon and Espeon, and then XD brought me my Jolteon. Though when my game didn't save after I played it to where you evolve, I did have a Flareon. Personally love fire types over water and thunder types.