Pro Sport has better balance and personally, I find it easier to shoot than my TX. I think this "hold sensitivity" thing is more about which gun suits the particular shooter. They both shoot very well, it's just that I find the PS easier to deal with, possibly because the weight sits further back.
Cocking system on TX is better than a crappy M5 cap head screw sideloaded as per the Pro Sport system: keep it tight and use threadlock!
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