GT350R and 5BW 6sp owner here. Interestingly, I find my 350R Recaros more comfortable for longer trips than my 5BW with the sky cool gray seats. I took the 350R for a 3k mile roadtrip out west a few years ago and did several days of over 700 miles with zero issues. The BW seats just aren't as comfortable for me and I squirm a little after maybe 90 minutes. Also, the 350R gets better mpgs cruising at high speeds than the 5BW does and they have similarly sized tanks.
As for the driving experience, I always joke about the 350R being an OHMYGODMYHAIRISONFIRE kind of car, meaning it's rowdy as heck and wants to be driven harder and harder. The 5BW is a calmer experience because it's quieter and a little more distant feeling, the engine doesn't rev out as hard and has so much torque that you don't go WOT nearly as often. But . . . the 5BW is an absolute animal once you get confidence in it. It LOVES being driven like an animal and gets better and better the harder you push on a back road. If it had a better sounding exhaust and an engine that rev'd another 1000rpm, it would be even better.