I've had the good fortune to ride a 2002 WR250F and an EC 200 back to back, here's what I found....
WR has a wonderfull motor! Smooth, and as mellow or fast as you want (mellow at low RPM, rocket when screaming). Starting is not an issue, if you follow the starting procedure religiously, don't and you'll pay ;)
Downside, it felt wide at the tank and somewhat difficult to get forward on. Bars too far back on triple clamps. Seat is very comfy though :D Suspension is soft and feels very comfortable, at least until whoops get big, then it is too soft. Nothing that could not be tuned out or valved out.
EC200 is very light feeling and confidence inspiring. It feels good no matter how hard you slam through whoops or roots/rocks. The motor is very smooth with no hit or punch in the power, just smooth and seemless. Ergos feel like a Japanese MXer, slim and easy to get forward on. Seems to thrive on standup style riding...just lean her in. Starting is a pleasure, as with most 2 strokes. THe hydraulic clutch should be standard on every bike, it's awesome. Getting off my CR250 I can throw the 200 around like a hero and go significantly faster than my CR in the tight stuff. Negatives...would like to see the gripper seat cover extend down the sides of the seat, instead of the graphics (for gripping with knees) and would like a straighter bend bar (I would run straight pipe if I could get it ;) ). Cool retracting kick stand comes stock and tucks up very nicely to the frame. I'd remove the one off the WR.
I personnally thought the WR was the best woods bike I had ridden, until I rode the GasGas. Given the choice, all things equal, I would go GG. It has a much racier feel without being intimidating, and I wouldn't have to buy a top triple clamp to get the bars out of my lap (like the WR)(this is a personal thing only).