Well the reasons I suggested the Titan were its ground speed is 7.5mph and Blade tip speed is 18000 and would give you a better cut. It also has a 13 position cutting height vs the 7. I guess it comes down to what is important to some may not be as important to others.
Speed is not very important. It's a tight 1 acre and not many open areas. Never thought about the tip speed and more cutting positions.
I do like the ZT XL because I can get a powered bagger for all the crazy leaves I will have.