I've owned both, the GSLC for 3 yeas and the XR for 2 years and did 15k plus miles on each of them.
My experiences FWIW as follows:
GS LC: lovely relaxed engine, lots of low down grunt, comfortable over long distances, reasonable handling. Very easy bike to ride, in the dry or wet, even when fully loaded with camping kit. Also surprisingly quick down the back toads when pushing on a bit. Only issues were the flappy valve thing stuck early on, but that stopped when I fitted a full Akra!
XR: Masses of power when needed, but it's an in-line four so needs to be ridden like one. No vibe problems with mine at all! Handling was sublime, with razor sharp turn in and precise steering. Super fast in the dry, but I used to find it a bit of a handful in slippy, wet conditions. Comfortable over distance, but fuel range when pressing on was much worse than GS. Basically a sports bike on stilts and requires a lot of skill and concentration if you're riding it hard as it's stupidly quick. No reliability issues.
I very much enjoyed both bikes, but they are completely different in character. As bike choice is a very personal thing, it's no surprise we get difderent views from different folk. The only way to really know if you'll like a bike is to take it for an extended test ride (more than once if at all possible!).
As for me now, I've gone Orange and am most happy with that decision
