i'd go with the brake away throttle control for safety reasons, but i would test it every ride to make sure its is functioning properly. nothing could be worse than not being able to stop because of a stuck throttle. the brake away disengages the lock when you squeeze the brake ever, while the throttle lock you have to hit the release button. in panic situations the last thing you want to do is look for a button. that's my take on it. i'm thinking of getting one next season and the brake away at this time is my choice, even though it's about $190 vs. $40 for the throttle lock.
safe riding this weekend, john