I've listened to both versions of the same broadcast but they're on two different systems: my main rig and my iMac. The FM version has that air and all that I've been used to hearing all my life and it's quite satisfying.
The streaming version sounds a bit more intimate and yet homogenized at the same time. Maybe antiseptic is a better word for it. I know it's apples to oranges due to completely different set ups but when it comes to listening, I always go for the FM. For the short time I had the iMac hooked up to my stereo, it was the same result.
All the best,
Nonoise