People can give lots of brands for suggestion. But it’s really a trial and error sort of deal.
Personally, I like Okamoto Super Big Boy and Mega Big Boy, they’re made for XL cocks like mine. Wonderful fit - girth fit is superb, length fit is great though if you’re really long like I am then the condom will leave an inch at your base uncovered. They’re not uncomfortable at all, thin enough to ensure you really feel the sensations, and can hold a huge load very well.
10/10 from me. I’ll take magnum XL in a pinch though, but so far Okamoto has some of the best fits if you’re very well endowed in girth, length, or both.