Does one have a noticeable accuracy advantage to the other in a non benchrest quality rifle?

The Redding die will probably work with all fired cases. If your rifle has a large chamber it may not fit in the Wilson seater.

Basically, no. Even in a BR rifle it might only be a .050" moa difference but that's a LOT in BR competiion. It would likely make much less difference, if any, in a factory sporter.

Get the conventional threaded dies, Redding, etc. Wilson diea are just to darn difficult to get into our presses!

As has been noted, Wilson dies require a different type of press for bullet seating and are basically hand dies. Much slower, and for a non BR rifle I don't believe you will see any difference. You could try Lee's neck sizing dies, but my experience is that you will eventually have to FL size.
Peter.