My vote goes for the Patriot single cam. Though not one of the two you listed in terms of price the Patriot single cam would seem to give you the best of both worlds...

...in other words, you get the same if not a tad more speed than the LX but with a larger brace height and a slightly lighter mass weight......but also still get the low recoil, low vibration typically found on all of the parallel limb design bows. Plus, you can adjust the letoff/valley on the Pat SC and the draw length is easily adjusted via the modular system.

Seems like a no brainer to me. I am not parting with mine for quite awhile and that says something.