wow..this question seems to pop-up at every forum.
I have both cars, and to say that one is better than the other would be an understatement.
First, the 414 IS very sensetive to set-up changes. but not saying the T1 isn't. it's just the that the 414 is a little more tricky.
One other thing is parts availability, being in a country like the philippines, I had to wait at least two months to get a part for the T1, as for the 414 I just go to the loal distributor and get a part for the TA04 which is basically the same car anyway.
ON TRACK, they are fairly on par with each other in the hands of good racers, it all ends up on what is more important to you, a car which have good parts availability like the 414, or an exotic which is the T1.
More like a choice between a Ferrari and a Skyline GT-R.
you won't be dissapointed with any of them anyway. they're both top-class cars.