Can't really compare... but I've got the Baader Hyperion Zoom.
Bit extra FOV than WO (I think from memory). Sharp all the way across. Best between 8-20 (not much extra viewing with 24 click). Not parfocal, but only needs a little adjusting.
Watch out for quality control... friend and I bought one each, and both had different problems!! Were able to exchange them though... the one I've got now is suprisingly good
