Bates saddles are build on the same tree as wintecs, so they are essentially the same saddle, bar one being finished off with leather, and one with synthetic.
From my experience, the Wintec range does not suit the Thoroughbred horse, as the tree is not curvy enough. Wintecs and Bates appear to be more suited to a wider horse, like a cob. The tree on a Wintec or bates is like this: /\ Straight down both sides. You can even observe that by simply lifting up one of them, and comparing the basic shape to a saddle with a more curvy tree, for example the Ideal range, which are more like this: ()
Ideals suit a wide variety of horses, and appears to be the only brand that suit Diddly, who is almost pure TB. This is due to the curvy tree.
As the bates innova is a dressage saddle, it seems that you want to do dressage (obviously!). I have found that as Warmbloods dominate the dressage world most saddles are geared to suit the big round barrel shape we associate with the Warmblood. Totally the opposite to the narrower, curvier TB type. The only brand I have ever found to do this curvy tree that actually fits a TB is Ideal. I own the Jessica saddle, and Diddly pricks his ears and smiles when I put it on! My saddle fits even my friends 13.2 part bred Arab, who is quite different in shape. Here is the Ideal site-already in the dressage saddle section-, if you are interested: Catalogue - Dressage Saddles
As seen, they are pricey, but I got mine second hand and good as new for around £360 :)