I bought both the EWT Kill-Light XLR250 and XLR100 from Whiteknuckle a while back and they are both great lights. I use the 100 for a scan light that I keep turned on the entire hunt, while attached to a strap on my head. It'll light those eyes up way out there. I use the 250 for a kill light and it can "usually" ID a yote out to around 200 yards. (The only exception is on really bright moonlit nights and if the ground is foggy).
Personally, if I had to go with one light only, I'd go with the XLR250 hands down. You can't got wrong with it and it's well worth the cash.