One of the main reasons I prefer a top loading album is the fact that I don't have to scrap in order or plan ahead. Much easier on me
My CM albums look very nice, but I have had problems with the page protectors tearing easily. This may happen with the Dalee's also, I just haven't had that problem yet.
Giselleacttwo and Lmiracle have a good point about dust on top loading albums. But I have seen a couple of companies(Highsmith is one) that make album holders that would protect any album from dust. It's probably not a bad idea for any type of album.
As for the size of the album, that depends on your pics and how you work. I personally work best in 12x12.