Current trend is for USB recharchable lights and they are plenty of good ones.
Important things you have to consider about your riding needs:
-What is your budget.
-What running time do you need.
-What light output do you need (riding in city, rural area, forest, only needing a light to be seen...). A 1000+ lumen light is probably overkill for commuting.
and other things that you have to consider about the lights:
-What kind of beam pattern does the light have? (Some lights have focussed round patterns, some square to not blurr traffic, others super wide for offroad riding).
-Real lumen VS Lumen announced by company? (Many Chinese lights might say that their lights have 5000 Lumen but actually they might have only 600).
-Is the light waterproof?
-How stable is the mount and is it easy to detach the light when needed?
-Does the light fade over time?
-How easy is the light to handle?
-How many different lighting modes does the light have?
Heres a recent review of 2014/2015 lights:
http://reviews.mtbr.com/2015-lights-shootout
http://reviews.mtbr.com/2015-lights-shootout-beam-patterns
http://reviews.mtbr.com/2015-lights-shootout-lumen-measurements
PS: More power or Lumen does not necessarily mean better!