If you've browsed this forum at all then I'm sure that you're expecting the answer that I'm about to give you..............................Buy them Both!
As seaneldon said you should get them in your room and see if they work for you, but once you do you'll want them both.
The Royer in conjunction with a 57 on loud guitar amps will give you great options, great for horns, acoustics, hell try it on everything!
Same goes for the u195. Works well on a variety of vocalists (but not all) great on acoustic, I have a pair that I use on drum overheads most of the time.
CHeck em both out, you can't go wrong.