like others have said, which is best really depends on what you want to to do.
Question such as
How important is it to you to participate in the Alpha and Beta testing phases?
How important is it to you to Help build the world for launch by participating in exposition.
Do you want to run a town?
Do you want to adventure?
ect
Personally, I started at founder, few months later upgraded to bloodline, then few months after that decided to upgrade again to mayor. then few months after that bought some EP.
and it wasn't that I couldn't have afforded to j ump right to where i am now. it was that, those investments sounded right to me at the time. and as time went on, and the released more info.
I wanted more from them.