2 cents.

Baby Boomer here. Still wear Speedos at the pool for work outs.

Tri-shorts the rest of the time. The tri-shorts are definitely slower, maybe a second or two per 50 meter lap. The extra drag probably makes sense from a training point of view, but I like the Speedos better. The tri-shorts may be a bit heavier made than the speedos and seem to last marginally longer.

My opinion.

Tyson