The sport seats adjustability is phenomenal and they may just be the most comfortable seats of any supercar I've ever driven.
However, bucket seats for me are a must-have. It may not be for all. Although those 10-20 track days a year may only be a small % of the time I'm actually driving the car, not having to keep myself in the seat with my left foot and white-knuckling the steering wheel make it a no brainer to go with the buckets.
Thankfully my wiry Irish build was also made for these. If you're too tall, wide, or just generally above average I don't think the buckets are what you're looking for. Ironically, a lot of other super cars don't have an option similar to the sports seats which just makes the R8 that much more daily driven friendly for many.