I think this is the only anime I have ever seen. Tough I saw the americanized version (and I hear it terrible). But GT made no sense to me so I'm going to say Z.
Whenever I think of GT, all I can think of is the Bon Para Para dance/attack sequence. It was quite painful to watch, although funny to look back on.
Dragon Ball Z wins hands down for me, but I didn't hate the majority of GT as I hear some people do. Dragon Ball Z was my favourite childhood show, that I still find enjoyable to go back and visit everyone once and a while.
If the original Dragonball series was part of the poll, I'd probably pick that.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.