I am kinda in the same predicament (except Toro instead of Zone). I think I've had the same ROG flat Champ Gator in my tournament lineup since 2018 so it is very familiar to me. I've tried some DX, KC, and XT Gators to see if they would fit the bag and find them a bit less stable to start - basically taking away the FH utility for chipping up to the green on approaches.
Toro is a more recent addition but doesn't quite have the same stability & distance (slower flying) potential in the different plastic blends I've tried (Metal Flake Ch, Gummy Ch, stock Star & Champ, Color Glow Ch, R-Pro). I like the Gummy Champ and Color Glow the most so far. R-Pro is nice for less ground action vs. the premium approach discs - still more stable than Star Rats - but I worry about replacing them (already chunked the rim on one of the 2 I purchased on a fence).
I've had flatter R-Pro Pigs in the tournament lineup prior to the Toro and may go back to them if my Champ Rhyno isn't working out for approaches in practice. I like the thumbtrack Pig better for headwind puts vs. the Toro/Gator so
I wonder if a different plastic blend for the Zone might produce a bigger difference in usage vs your MF Gator- Maybe one of the FLX blends? Also, the gaps between discs of different speeds can widen if you throw harder/softer or FH/BH predominate so some players might get different utility/range with different molds. If you play/practice in windy conditions a lot then you should test them out in various wind directions to see how they could overlap.