In a similar thread years ago there was a recommendation for Exofficio brand which I bought a few of to try out and have since replaced all of my underwear with. Their boxer briefs are fantastic.
I've gone with MeUndies after a sponsor spot in a YouTube video that was actually good. They do tons, like TONS of different designs. Pricey, but made extremely well. Plus, all of the packaging is recyclable.
They also have a subscription model that's literally just pairs for a discount monthly, and you can select a random design.
Been using me undies myself for just over 6 years. Theyre started to break down over the last year. One complaint i have is the purple lining they use for the elastic seems to leave a mark around my waist. I've been waring them inside out to accomidate.
I'll be trying some lttstore undies soon. Hopefully theyre similar quality but slightly longer lasting.
Personally, I've been a fan of saxx. Expensive, but I'll try and get a new pair if I see them for half off.
To be honest, for everyday wear, I've got cheap costco brand underwear that's lasted me probably 200 wears. I only use non-cotton underwear for athletic activities, though, so that cuts down on a lot of wear and tear.
I've heard good things about Duluth trading company, but never tried them.