Having experience with both, my vote right now would be for the Act labs guns, simply because I cannot get the LCD Topguns to work reliably. I'm gettting closer, but still can't make them "dependable".
The Act Labs Guns worked great right out of the box.
I finally can get my dual Top Guns recognized by Windows, but in the middle of a game (HOTD 3 for example), they simply loose their USB connection. I even hear the "double bell" from windows as if the USB cable was removed. I already have the recoil disabled on both of the guns (that seemed to resolve a lot of the BSOD problems I had previously), but I still keep having issue after issue.
My hunch is that the problems are somehow related to USB power, but I'm still testing.