DFW

I haven’t used the 15-45 but I own the 16-50 which came with my xt20 and it is a great lens. Takes beautiful pictures. I bought a 18-55mm because I wanted a Aperture ring like my primes I use the most but after comparing those two lenses I am going to sell the 18-55 and keep the 16-50 because it just feels better on the camera. Really hard to tell the difference in picture quality. Don’t think you would be disappointed in the 16-50. Going by the quality of it and the xc50-230 which I have as well I am sure the 15-45 is probably great as well so you should pick the one that’s focal lengths work best for you.

I don’t have any experience with the XF55-200 but have the xc 50-230 that came in a kit with my xt20 as well as the 16-50. I have been blown away by the quality of shots taken with these two xc lenses. And I am the same as you stated above not really a long zoom user so it will probably be all the long zoom I will ever need. Sure it is made out of plastic but feels really solid and while not the same build quality feel as my XF35mm it is not far behind. And it balances really nice on the xt20. Do a Flickr search for this lens and you will see lots of great pictures.