I'd have to say the reason the Brunswick is leading the pool, is a lot of the older guys that have played for many years and grew up and played their whole lives on GC's are diehards. A lot of them probably havn't even played on a Diamond. I started on GC's but the first time i EVER hit a ball on a Diamond i said "WOW". Take this poll again in a few years and probably Diamond will blow it away. I'm as unbiased as they come and i love GC's but in terms of playability the Diamond is easily better (to me).
I think you're right about this. Many of the younger generation (myself included) are becoming diehard Diamond aficionados, much like many of the older players are diehards of GC's.