I only have experience with the planet bike super spot and the cateye el-520. I got the cateye because the planet bike was damaged for a while and I now use them both. Both together are damn good where they are pretty good single. I chose them because they're good but not expensive. These are decent lights that hold a charge for a good amount of time (12-20 hours) instead of burning out after 3 hours like most of the bright ones. They won't light up everything in front of you but they will light up your path enough for you to see it and will be visible to motorists.

Like others have suggested, your ideal light depends on how you want to use it.

Oh, I use mine for commuting in and around a small city.