My personal favorite are Duluth Trading Buck Naked. I’ve had a few pair have the elastic waistband start to stretch to a point things don’t stay put. But those are ones I’ve had for about 10 years. Never had any other part wear out. Keeps me cool, since I run hot. They have both boxers and boxer briefs (and maybe briefs). They are somewhat expensive at ~$22/each, but you can wait for sales to get them about $16/each.