Akatosh, always Akatosh. In Daggerfall I quickly rose through the ranks in his chantry. Increased travel speed is cool, among other things. Plus he's the god of
time and DRAGONS. Holy. [censored]. I don't care what kind of born you are or how played out it is, I love me some dragons. Imagine being one of His chosen (not Dragonborn, who use the Thu'um granted by Kynareth, but one of his actual avatars, like Martin Septim but longer lived). Imagine those powers over time and that dragon form. Holy. Mother. Of. [censored].
Akatosh, definitely. Followed by Arkay because dark n edgy, then Julianos because who doesn't want to be a wizard.
Three way tie between Shezarr, Akatosh, and Talos. As for Daedra, either Sanguine or Sheogorath. They know how to have a good time.