My good friend and riding buddy has the 2002 wr250f, I have the 2001 220 with the usual mods. We have switched bikes on and off and here is my opinion(emphasis on opinion). The two are pretty matched for tight woods/ hs use, so as far as power delivery it would be a preference as to 2 vs 4 stroke. The wr suspension was real good in stock form for my weight. The negatives I noticed on the wr are - weight carries higher, heavier, hard starting, even after you know the drill on starting compared to my 2 smokes one kick and rip. The seat on the wr is about a comfy as a piece of plywood.
Lew