One of my favorite lights is an Olight S1R which has been flawless. My Zebralight has also been flawless. I have a few other Olights that are without issue.
I liked the Olight S1R and it performed well but I by far prefer my Zebralighgt SC62 . The main reason is the recessed switch on the Zebra and the second is the screwed on clip. I never trusted the Olight in my pocket because of the switch. I know it can be locked in off, but I just didn't trust that. I also had the clip snap off the Olight a couple of times when I was working in tight quarters and it cought on something. There is also no positive protection against directly shorting the battery due to the magnetic charging system. Theoreticaly a key could contact both terminal points at the same time and if remaining there for more than a moment the battery could get extreemly hot very quickly. The charging system is very good and very convenient, so if you're going to cary the Olight in a pouch or away from loose conductive materials (keys, coins, small MTs etc...) it's awesome. Both brands are awesome. I just prefer the Zebralight. Either way you can't go wrong.