The UC has a trigger lock and an accessory rail on the dust cover. Not wanting those items is a personal preference and not a reflection on the pistol.
I have not shot an LC9 so cannot make a comparison. My choice of pistols runs to cZ and Browning HPs and I find the Thunder 9 grip is a bit larger. As far as shooting the Thunder 9 goes, mine has the best trigger that I have found out of the box. Other shooters have made the same comment.
For opinions and information on Bersa pistols, I suggest you visit Bersa Chat Forum - The Front Page