Both options would be good for different reasons, so it might depend on your priorities and expectations. The Pioneer would be quite feature laden compared to the UMC, and quite flexible. On the other hand, those Wharfdale's are not efficient and may need more power to fill your room to wanted levels. It might help to know the size of your room and the volume levels you're expecting.
If you have a larger room, you might want to go for the Emotiva option, depending on how loud you need to go. One other option is to get the Pioneer and then 6 months down the road, when Emotiva has their July 4 sale, pick up the XPA-5.