Yeah, shorter boxer briefs.
I have big thighs that curve in a lot at the top, so anything with any amount of "leg" will climb up my leg and bunch up in the indented area at the top of my inner thigh. Boxers are really bad that way, but boxer briefs do it too. But regular briefs look too much like diapers to me. So I go with trunks.
It's a shame they're so hard to find 🙁 I got a couple packs of a cheaper brand that called themselves trunks, but they were just boxer briefs.