I'd suggest you do a quick search using the CPF google engine at the top of the screen - you will find a plethora of information on the topic that can get you started.
I've always owned petzls and been happy with the quality - even with their basic models like the tikka.
Rugged, bright, multi-levels, superior waterproofing, reliable, light. Only drawback is AAA batteries- however the low level is adequate for almost everything including trailwalking.