My wife and son both spin (with peddle's) they have both the Ashford Kiwi, and the Traveler (with the Jumbo Flier), along with a Babe-Production.
They use each for a specific thing. The Kiwi is wonderful for Angora, the Traveler is for Alpaca & sheep, the Production is wonderful for plying. And me, I'm a drop spindle and Walking Wheel spinner. I can spin "almost" as fast as they can w/ my walking wheel. Then I like to ply with a drop spindle, that's the fastest!
It all depends what you like, we find the Kiwi to be the easiest to travel with (it lays flat nicely). But we usually take them all to a fiber-fest when we go. As long as I have 48" of horizontal space, my walking wheel travels as well as the rest.
Go to an event, see how every one does w/ their wheel. Try out a few & see what you like. Most vendors should let you practice before you buy!
Good luck picking one...