Is there anything in the game level-for-level stronger than an optimized Archivist?

[eternal]

I'm saying that planar shepherd would likely be stronger, but that druid on its own likely has an edge across a good level range as well.

I thought you were saying as much. It's late and my brain isn't all here. I figured strait druid would be enough, however; if we're talking TO I couldn't resist bringing in planar shepherd.

edit:
I guess the same could be said for aberration wild shape and assume supernatural ability. Put the two together and I'm not sure if there is much that could win against that.