It's pretty much owner pref. The XC costs more with the full fairing and all the gadgets that come with it. The XR cost less, has less gadgets, and most likely won't cost additional $$ to cure wind management issues.
The majority of XC owners upgrade the windshield, add lowerfork mounted wind protection (lowers) or both. The majority of XR owners don't change anything and when they do it normally involves adding the lowers mentioned above.
A few people (myself included) bought the vinyl highway bar closeouts (elephant ears). These are quick to install and don't cost mush ($99.00). I haven't heard anything about anyone disliking them; most remove them over 60 degrees because they work too well. I live in Utah and rode my XR at least 1 day per week throughout the entire winter. My mid-height windshield and elephant ears worked well even with windchills close to zero degrees.
Winter riding has less to do with the bike than with the driver. If you tolerate cold well and dress right you can get away with riding year round as long as the roads are clear.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.