I assume you want a remote unit. The Foxpro is an excellent caller. So is the Loudmouth. They are close to each other in quality and price. Foxpro gets the edge with their excellent sound library. The Wildlife Tech. unit is good and has a great sound library. It is way overpriced for the market and is cumbersome to carry though. Both Johnny Stewart and Burnham Bros. are coming out with new digital remote units in a very short time about $200 less than the Foxpro and Loudmouth at about $300. They are not apples to apples units with the Foxpro and Loudmouth, but they both look to be very good. Extreme Dimensions has also introduced a new Phantom upgrade with a remote. They have very few sounds though. I can't speak to the quality because I don't have any knowledge of it.
All things being equal, if I were going to buy a digital remote today, I would get a Foxpro. If your budget is tight, get the non-remote unit that can be upgraded later.
FYI-Foxpro is about ready to introduce some new units.........
I intentionally left out Western Rivers and the Predation......you may read into that what you want to.
Good Hunting!