Their descriptions are pretty accurate, but to really appreciate a Lace Sensor, you have to go into it with no expectations.
All 3 of those sets are highly regarded, but the Ultimate probably sells the most. Image a P90 in the neck, 70s single coil in the middle, and a hot humbucker in the bridge. Now take two steps to the left. That's what the Ultimate sounds like.
A full set of Hot Golds is also pretty popular. That's in the same zip code as the Duncan SSL-1 sound in the neck and middle with a slightly hotter bridge.
What types of pickups do you usually like?