I see... we are from the same place!
I have both, and can't say which one is the best. The L6 has a better throw, while the U2 is more an universal illumination tool.
Should I choose one, I would choose the U2. It has a throw that is comparable to the L6, is adjustable, smaller, run on rechargeable 168A. Having an U2, you may not need another LED light, if your purpose is to use the light for work or duty.
Story may be different if you start liking SF lights as collectables, or for hobby...
Anthony