I voted for Arkay but I wish I had notice you could make multiple vote because I really like Julianos and Dibella too.
I like Arkay to most, mainly because I like the health bonus his shrine gives you (so helpful for low-level characters) and the priest of Arkay, Runil, in Falkreath, who's one of the few Altmer in Skyrim I actually like.
For my Dark Elf, I have her drifting away from her Morrowind upbringing of worshipping Azura to worshipping Arkay. She also has a lesser devotion to Dibella.
While my Wood Elf is agnostic and keeps his distance for all this, his husband, Marcurio (as I am imagining hm in this game and in the fanfic I'm writing for this character) is devoted to Julianos.