I know LMS really does control the market share and I can't say much about Unleashed because they are relatively unknown to me. While Lund is pretty new to the EB market they have been tuning huge power TT and Supercharged mustangs as well as a lot of other custom tunes for quite a bit and their numbers are some of the most impressive out there.
I decided it was worth taking a chance on them and overall have been pretty happy, just wish that SS tune would come out, but speaking of the devil, they responded to my email today so at least I know they are still alive over there! An ETA of soon is still better than an ETA of never.
One thing I really liked is that Ken over at Lund drives a Sport as a daily driver so stability and driveability is high on his list, and the fact that he's going to keep working on evolving it until he's happy!