For walking, I use a snap on nylon martingale collars and 6' nylon leashes with a snap on both ends. One leash is a Petsmart brand, and is five years old. The other I got at Tractor Supply Co, and it's easily four years old. One dog's collar is a Frisco brand (available at Chewy) and the other's is a Petsafe branded one.
For non-walking gear, My GSD has a DogsArt collar that is six or seven years old now for her tags, and it's held up remarkably well, considering she wears it pretty much 24/7/365. my pittie has a leather collar I bought on Etsy maybe two years ago for her tags, and while it's okay, I wish I'd gotten her a Cali Girl collar instead. My late dog's Cali Girl collar was butter soft the day I got it, and she wore it 24//265 for five years, and while it faded some, it still looked good.