What kind of car do you have?
The serpentine belts used in most cars in the past 20 years are pretty damn near indestructible. Usually they only break if the tensioner breaks or one of the belt-driven accessories seizes up. A lot of car manuals don’t even call for periodic replacement anymore, just occasional inspection. I once put around 200,000 miles on a belt on my old 80’s Buick when I was commuting a long distance-- I had a replacement belt in the car and it was easy to change, but I held off on actually doing it out of perverse curiosity as to when the belt would actually go. It ended up outliving the car.
The old style V-belts are another story. The key really isn’t the brand of belt or anything like that, but keeping the tension adjusted. If you’re having regular problems, you might want to invest in tension gauge and learn to check it yourself. Learning how to check and adjust the tension yourself also means you shouldn’t have too much trouble changing the belt itself, and so you can carry application-specific spare belts instead of a rinky-dink emergency belt.
ETA: Oh, also, a bad pulley will drastically shorten the life of V-belts as well, so you might want to give those a look over.