I think the main players today are the Luxeon I, Luxeon III, Luxeon V, Cree and SSC. I think that most of the others are trying to hit price points rather than improved the technology. Crees and SSCs are the most effecient. The Lux Vs are probably best if you want the widest hotstop, but they tend to have more issues with donut holes and though they've been out for several years, the X bin Lux Vs are still basically impossible to get.
Bottom line, for a brand new light for an EDC, a Cree or SSC with a proper heatsink is likely the best choice for 99% of lighting needs. The USW0H is, in my opinion, the most choice bin. The USW0I will have slightly less runtime but I wouldn't sweat the difference.