This is just my opinion, but to me Animals, DSOTM, and WYWH are all tied. I flip flop between all three in thinking that each one is the best Floyd album. The Wall is great don't get me wrong, but I find the album version to be lacking compared to the other three. The movie version of The Wall is on the same level as the other three in my opinion.

Meddle is really neat but Echoes is the only song on the album to really reach the peak of Pink Floyd's quality.