Probably a little late to answer this question now but maybe someone else is interested. It's like with phones and cars. If there was one "best" product then market forces would dictate that in a short time it would be the only one left. Rather, there are many different products because different customers have different needs.
RootsMagic may be the best value in Windows genealogy software. It supports detailed, well documented research. It does not play well with Ancestry.com. If you are dedicated keeping your trees on A.com and must have a live sync function then you probably want FTM. RM can be made to work on a Mac using Wine or Crossover but it wasn't designed for a Mac, so if you are using a Mac you might want to pick another program.
At this point in time, newbees may find the source citation system in RM a bit overwhelming. As I said, RM supports detailed research and the source citation system is very long on details, too long in my opinion. Of course, you can use it any way you want but at first glance it seems a bit much.