I kind of want to be edgy and say Sithis, because he's the thing that embodies things where things are not (at least I think that's how the Void works), but it will have to be a toss-up between Talos or Arkay for me. I like that whole idea of, mortals ascending to godhood.
I must say Sanguine... Is just I enjoy life too much, is not I'm constantly going to parties or having lust, neither I'm an addict to drugs or alcohol, but I must admit I know how to have a really really good time when is time for feast... For me life is too intense, being in good or bad mood, is too intense, If I suffer oh hell I really suffer even is reflected literally on my body... but If I have joy and pleasure.... is the opposite..., in good mood I can do everything with passion and everything is amazing, so why not worshipping such migthy Daedric Prince Sanguine, having some nice time also pass at the pocket realms of The Myriad Realms of Revelry time to time... then going back to the world refreshed and full of joy, oh but as is said extremes aren't good, so I would try leave those realms before I get too wasted, I'm pretty sure If one get more one can bare then going back to world after partying at such epic feasts would be the opposite of joy...
Oh and maybe would call Sheogorath time to time to join parties but doing that probably would be end bad or maybe with more fun...
I think mine changed again. Since, I started using the Wintersun faiths of Skyrim mod. I would say my new favorite deity what be Phynaster. He is the hero-god of Summerset and is worshiped my Altmer, Snow Elves, and Bretons. He taught the Altmer to extend their lives a hundred more years, simply but shortening their stride. He was also said to go on adventures and made a ring to protect him on his wild adventures. So, I like to see him as the god adventurers and travel.