I can only comment on the 1.75 TC version of either blanks, but for a start while very different, they are both superb.
Compared with the GTI, the Torrix is 'faster' actioned with more power in reserve, whereas the GTI has a more compound action with a tip that bends through to the butt section which gets progressively stiffer. Through-actioned but far from sloppy.
90% of the time the GTI has the nicer fish playing action, imo and obviously very subjective. Where the Torrix comes into it's own is when you need to put the breaks onto a biggie heading towards trouble.
The 11' 1.75 GTI also makes a good tench rod, whereas I didn't think the Torrix did.
The Torrix is lighter, but in practice you would only notice this if holding the rod for a long-time, say for rolling meat for instance.