If you are worried about him getting caught on something and hurting himself get a breakaway collar, that will come apart and the dog can't hurt himself as the collar will come apart and just fall to the floor, you can't use this as a tie out collar as any stress on it will make it open up.
I've used mostly nylon collars for my dogs, or leather collars. Hans has a leather one now and has had it for years. We never put the collar that tight on the dog, so if there was a dangerous situation, where it got hung up on a tree branch or something else, they would be able to wiggle out of it and free themselves. Never had an issue with it coming off on its own. Same for my cat, he can slip out if need be, loose enough for that, but it stays on.
Those 'breakaway' collars are great and the best thing for cats who climb trees. But it's important not to put too much pressure on them, and not to attach a leash which you are relying on to hold the dog, if it suddenly pulls forward. And the more they are opened and closed, the weaker the fastening can get over time.
If a dog wears one of these, the leash should be attached to a steel ring in a harness or something else.
For my it depends on the season.
I use Lupine collars in the summer. The are a very good quality and have an awesome warranty.
In the winter I have leather collars for them.
The reason for this is although Rudy doesn't swim i do not want them getting their leather collars wet.
However, The boys only wear collars if we have to go anywhere. We live out in the country and I was too worried about them getting caught up in something on the farm.