I agree, here we go again. everyone will say that theirs is the best. it will be hard for you to get a decent answer but I hope this helps.
I currently run the Thundertiger ST-1 (got it a week ago and raced it for the first time on the weekend). I used to have a mugen msr. I found a world of difference between the two and can't believe I didn't get this one a long time ago. If you have any experience driving/racing, I would suggest going to the local track(if you have one) and talking to the racers. They will most likely let you try theirs for a couple of laps to get the feel of it! But PLEASE don't try this on a race day!!!go on a practice night when the guys have alot more time to talk and help you out.
Hope this helps a little