I'm playing with my fifth character (or, at least, the fifth to make it at least into his mid-20's), and I've finally discovered that Conjuration is the bomb. No worries anymore; if I walk into a tough encounter, I just conjure up a tough ally to fight for (or with) me. Right now, I'm at Level 22, my Conjuration skill is 89, and my Intelligence is 100. I have hotkeyed "Summon Daedroth" and "Summon Spider Deadra." The Daedroth seems to clobber the enemies much better than the Spider Deadra.
Which summoned creature is the most powerful ally I can possibly conjure? Which one should be my "go to" for the nastiest encounters?
And does my summoned ally get more powerful based on my Conjuration skill? For example, is the Deadroth I conjure with a skill of 89 better than the one I conjured with the minimum skill of 75? Or is a Daedroth a Daedroth, and I get the same one no matter the skill?