I use that free promotional ones you get from events or other places. Those seem to last me awhile, usually until I get another one from some sort of event.
Lipsyl is the best and has the nicest packaging for a drugstore brand lip balm.
But carmex is #1 when it comes to curing really chapped lips. My lips are always dry but their products really help soothe my lips.
I'm a lip picker too because of my anxiety and carmex keeps my lips smooth and soft enough where I can keep myself from picking them.
I prefer the stick formula as it's less messy.
I also really love the Vaseline lip pots. The rose one leaves the perfect tint that's not too obnoxious or obvious, and it's not sticky like straight up petroleum jelly is. It's very balmy and has a nice slip. Plus its shaped Like a super tiny mini tub of Vaseline?? That's freaking adorable.
I find that a lot of other brands actually makes my lips more chapped and cracks them, even with consistent use though.