The Zebralights have always been fully regulated and don't care if you drop them in a puddle. I used to use Petzel's for backwoods canoe trips but they chew through AAA's when you are using them every night for a week or so, and for the privilege you get a constantly decreasing amount of light. I understand that some of the new ones are regulated, but I have no knowledge of those.
The ZL's were about double the initial cost, but being mine use AA's, were easier to feed and they love Eneloop rechargeables (recommended by ZL) (I have no 18650 powered lights) They are fully aluminum so much tougher, and they are smaller.
I have several Petzels where the plastic has aged and cracked making the light useless. ZL's are still going strong.
I also have some Fenix stuff, (as well as some FourSevens) it is nice, especially my AAA EDC light, but overall, ZL is ahead on both emitter selection and especially regulation technology. ZL usually for each model have variations of tint colour ie warm and cool and beam, spot, floody or full flood.
Highly recommended.