Mud Lord has a staff, the other has a club. I wanted to make sure they were different from the Bullywug Thug.
In my world, the bullywugs are degenerate slaads. Make of that what you will. ;)
I consider Legendary Evils a two case set. This one may be the first four case set in a long time. (Not that you need four cases to collect a whole set, but that you want 1-2 of every rare, 3 or 4 of most of the uncommons and 8 of some of the commons.) There are quite a few figures that have never been done before, like the Greenvise and Graz'zt. Now that I've seen production figures, I'm really happy with how the set shaped up.
I don't think there are are as many "wow!" figures in Savage Encounters as there are in Legendary Evils -- for example, it's hard to top that Balor with anything other than a huge -- but I think it's more consistent and the average figure in SE is better than the average figure in LE.
I'm not going to actively do previews right away, as LE is out as of today, I think. (I'm at home and don't have access to any sort of schedule.) Just stealth previews like this post.