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My cat came back from a garden expedition with his collar caught on a branch, dangling by a thread and a lucky break. He'd been out maybe an hour, and if the branch had been a fence post or a deck rail, the story might have ended with a strangled cat instead of a sheepish one. That night I threw out his buckle collar and ordered a breakaway, and I've never used anything else since.
A breakaway collar does one thing and does it on purpose: the clasp pops open under pressure. A regular collar is built to hold, which is exactly what you don't want when the loop snags on something your cat can't undo. Cats climb, squeeze, and wedge themselves into places their humans would never approve of, and a collar that won't release turns every branch and every fence into a potential noose. The breakaway trades "the collar stays on" for "the cat stays alive," and that's a trade I'll make every time.
The first one I put on my cat, he lost within a week, which is the other side of the deal. A collar that releases will release, sometimes at the wrong moment, often in the bushes, and you will buy more of them than you'd like. I treat them as semi-disposable now, cheap enough to replace, important enough to keep trying. The ID tag on it is the real value anyway, and a tag on a collar you can afford to lose is better than a permanent collar you can't.
Fit matters more than people think. Too loose and it slides over the head or catches on things even without pressure; too tight and it's a constant irritant and still won't break away cleanly. I leave space for two fingers under the collar and check it every couple of weeks, because cats gain and lose fluff with the seasons and a collar that fit in winter can choke in summer. The check takes ten seconds and has caught two that had crept too tight.
I keep the tag readable and current. A breakaway with a bent, blank, or missing tag is a collar doing half its job, because the whole point is that a finder or a scanner can reach me. I use a tag with my number and a second with "microchipped" on it, so even if the collar pops off, whoever finds the cat knows to scan. The microchip is the backup; the tag is the first word.
If your cat walks on a leash, a breakaway collar is the wrong tool for the walk, because the leash pressure can pop it mid-stroll and off goes the cat. For walks I use a harness, and the breakaway stays on for the at-home, in-the-garden life where the snag risk is real and the leash isn't attached. The two jobs need two tools, and mixing them up is how cats get loose or stuck.
I'd also skip the breakaway for a cat who's around other pets that might grab the collar during play; a tugging dog can pop it, which is fine for safety but annoying if it happens daily. For the average indoor-outdoor or porch cat, though, it's the single cheapest insurance I own. The branch taught me in one afternoon what I'd been too lazy to learn, and the collar I use now opens the moment it should, so my cat keeps coming back with stories instead of scars.
My cat has lost three of them now, which I've made peace with as the cost of the system. Each time I find the discarded collar in the garden or the bushes, I feel a small relief, because it means the mechanism did its job and the cat is home, unbothered, probably planning the next escape. The tags get moved to the new one within the hour, the microchip stays current, and the cycle continues. Cheap collars, a cheap lesson, and a cat who keeps coming back, which is the only metric that matters.
I'd suggest getting a couple at a time and keeping one spare, because you will lose them, and a cat without his breakaway for a few days is a cat one snag away from the story you don't want. The spares cost almost nothing and remove the gap. I also check the breakaway clasp itself now and then, giving it a firm tug to be sure it still releases, because a clasp that's gummed up with dirt or stretched out stops doing the one job it exists to do. A breakaway that won't break away is just a regular collar with extra steps.
The lesson was cheap and the alternative wasn't. If your cat wears a collar, make it one that lets go. The peace of mind costs less than the vet bill you're trying not to imagine.