It all depends on how you fly.

The 10cell set up makes charging a simple task. Also you its lighter with less wing loading. It has plenty of speed for most people.

The 12 cell set up has more top end speed. Me personaly I love the 12 cell set up. I also have the 5612 and its been rock solid for several years now for me. I did eat an ESC but thats the only problem I have had with it.

electra on 12 cell with 5612 is going to be around 185 mph straight and level.
electra on EVF2 10 cells is probably going to be around 175 mph straight and level.