You’ll improve your ability to balance with handlebars, as it will force you to learn!
They may get in your way in freemounting if you angle them high.
I have both the KH TBar and Nimbus handlebar.
Nimbus seems easier to attach (you don’t need to be a genius) and more study to me.
The KH is very adjustable but I had a UPD and that bent the pieces where the angle adjustment is very distinctly. Unfortunately I managed to do that on my second UPD with the handle attached. I did get it bent back into shape but I think it’s still a bit out of shape. You should also reinforce the seat using a reinforcement plate if using this handle.
Both of these handlebars may seem intimidating at first, but you’ll get used to them. If you always dismount off the front, I suggest you work on dismounting off the back.
Qu-ax handlebar, I haven’t used, but I’m sure it is fine and has its plus points. (I can’t buy it from my local Unicycle.com store, and I’m not sure it’s available for purchase in Australia which is where I am located.)
I’ve also got a short M41 saddle handle seat. The seat is different, it takes getting used to, but once you wear it in and get used to it, I got to like it. It does feel wider between the legs though. The seat is very short and I’m not entirely sure a beginner will love it. The handle on that feels very solid and reliable though. I think it would be very difficult to break or bend.