Both are quite amazing, but you're probably right, Yiruma has a lighter touch. I sort of have to give Yiruma's version credit for introducing me to Brian Crain in the first place.
Yiruma - 27.May
I was listening to the versions back to back, and I feel Brain's has a stronger touch, it's less afraid, whereas Yiruma's version is nearly fragile, as if he's afraid.
I think I prefer Brian's actually, and can't get myself to really enjoy Yiruma's, in the end...Yiruma - Kiss The Rain (Full Version)
Btw, the one you linked there is really good though.
It has a beautiful ending, too... the last 30 seconds I really enjoy, because they have a bit of a retro feel in style. Reminds me of a lot of piano music from the 80s.