While I cannot do a comparison, I will say that I have the skirtless kit, with delrin bearings in my TX200-3.
Before the install the rifle was a scattergun. A very good looking airgun, with a violent shot cycle. Cocking took some effort, plus you could hear the spring compressing, similar to a box spring on your bed.
After the install and tune (for JSB Exact Diabolo 8.44gr/4.52mm) the cocking stroke is buttery smooth and COMPLETELY silent. When you pull the trigger, the spring unloads with a snap! No buzz, no twangy noise, no vibration nor piston bounce felt or heard.
I just shot it a bunch at the indoor range yesterday. I swear that if your were blindfolded, I handed you the TX to cock and fire, you would have the impression that it was a gas spring.
My hat is off to Tony L for his engineering and execution, and Steve H (nitrocrushr) for his installation and tuning.
I would guess that you couldn’t go wrong with either version, with or without skirted piston.