Mostly, what you get are the same basenotes with a hint of this or that from the top/heart, so it's not a question of "better," but what you are seeking at that particular time. Of course, some frags are weak and don't have much to offer beyond a few hours, if that, but I'm talking about the long-lasting ones. For example, Michael for Men has a great drydown, but if you don't like certain notes, such as patchouli (or if you are not in the mood for it) then you might really dislike it.
Another issue is how common it is. Woody/ambers are very common, and some criticize this type of base for that reason, yet they are common because they are very good. Frags with a heavy mossy base are out of favor now, but are they "bad?" I find that they lack dynamism due to this heavy quality, but isn't it a matter of personal taste. One frag that I'm surprised by is Vetiver de Puig. I don't wear it often (once a month usually) but when I do I'm surprised at how good the base is (and it lasts a long time). The dynamism in that base is incredible, considering how "simple" it is considered by some BNers. But again, others may perceive it differently.