DarZeelon,
I have to agree and disagree with you....

I've had both engines. I like them both. I think that the Thunder Tiger is easier to set up and to adjust. I just never had the knack to dial in the ST. You say that "...the Super-Tigre carburettor allows you to adjust the mid-range mixture separately". Could you amplify that a little bit? If I could find that trick, I'd lean towards the SuperTigre. When running side by side, I found that the ST was much smoother than the TT.

The ST is 42 grams (about 1.5 oz) heavier than the TT, but I don't think that's a great drawback. That weight is probably in the muffler anyway.

As Ed Moorman observed, price, power, and weight are all about the same. It's a matter of preference. My only dislike with the ST was that I could never get it dialed in correctly. It always hesitated through midrange. When I tried to compensate with the lowspeed needle, the idle suffered.

But, I'd be willing to try one again if I could learn the secret to dialing it in properly.

Just my $.02

Bob