I love the toughness of the Parajet throttle, it's what I'm currently using and keep coming back to - It's the throttle I've used most in the past ten years as it just reliably works and takes the knocks. It can feel a bit cold in sub-zero temperatures. Good recessed and reliable buttons and the cruise control is consistent.
I used the Polini for about three years and trimmed the lever not long after getting it as it is definitely too long. Found it okay to use but too often I accidentally rubbed the kill switch on the risers, especially during a nil wind launch. I've known people have issues with the wiring failing although I didn't have that problem.
I thought the Vitto throttle was surprisingly comfortable but felt like it was going to fall to bits at any minute (it didn't). If it withstands abuse it would be worth looking at. But I have little time using that throttle.
For about three years I used a Chamelion Finger Throttle which I really liked - take a look at it as it's quite a different approach. It was great for keeping your hands usable and I thought it was very ergonomic. I didn't like that you could knock the off switch accidentally but in reality that rarely happened. Mine was the v1 and I think the latest are v3. That company also makes another 'outside the box' throttle which looks interesting. I'd go back to a Chamelion without protest.
Don't be scared of experimenting with different throttles or even going from right to left handed, it's actually really easy and your brain adapts quickly.
Good luck with your quest.