That would depend on whether you're willing and able to build soffits for your room, and the size of the room - if the room is tiny, then having enough space to move around and use your gear might be more important.
If your room has enough space so it's not a problem, almost any speakers will sound better in soffits and will need less acoustic treatment overall.
Placed up against a wall or mounted in soffits, any speaker will have more apparent bass output - since yours are passive, you may need to turn the bass down a bit to get the speakers to sound balanced - this is because when you mount speakers so they can only radiate sound in the forward direction, they are forced to put twice as much bass in that direction (called the half space mode) - so some sort of "roll-off" is needed at the amplifier to correct for this.
If you can, I would soffit mount - there is quite a bit of info on soffits both here and (I believe) in the Acoustics forum; there's more pix in the Studios Under Construction area, here -
http://www.johnlsayers.com/Studio/index.htm
I hope that helps... Steve