I think at this level it's splitting hairs. All 3 companies are great. I personally have experience with Speed Techs customer service and can say it's fantastic. I can't comment on the others, but hear great things about both.
I do like the way the Speed Tech system installs. And how the arm itself is fabricated. And its performance in a well sorted car speaks for itself.
The Ridetech has great range of adjustment, is very well made and has a proven track record too.
TCI looks to be a well made system with great on track results too.
Figure your budget, ease of install and overall use of the car.
You really can't go wrong with any of them.
But I have to say if it was my choice and my money, I would go with Speed Tech. Unfortunately they don't have a T/A system currently for second gens. (but I hope they do this year

. )