I have several thongs and jockstraps just to mix it up, my go to undies are Piado bamboo briefs or 2xist contour briefs in a variety of wild colors
I even still have a few CK tightly whitey briefs that are several years old but they are so comfy I just do not want to get rid of.
Briefs guy only, cannot stand boxer briefs as the legs ride up, less material the better. Regular boxers are so boring and not comfortable. I do have a few pair of shorty trunks or square cuts which are very similar to briefs.
Speedos and briefs offer the best feel and comfort to me. I can wear a thong but not everyday as I just don't find them as comfortable, but they are super sexy!