mkg335:
Lily, remember that the R1, including the one available temporarily at L93, is a L98 driver while the BB is L96. The higher level doesn't guarantee that the R1 is better, that's entirely up to individual preference; however, it does indicate it's certainly no worse and that it may in fact have a higher level of features than the BB.
I've never bothered with level either. The top Max irons are 4 levels higher than the top R11s, and you'd be hard pressed to find too many people who would use the blacks over the R11, unless they have the reflexes of a hibernating bear.
My understanding is that the longer run gives the R1 a bit more distance, which could help on the British courses. I'm content with my Bertha, because an extra 3-5 yards doesn't matter to me too much. My worry is staying on fairway, and it seems like Bertha has a much higher percentage to stick in places where I need it to, like Merion and Olympic.
Covert seems to be the "best of both worlds" to an extent. I hope to find out one distant day.