I'm pretty sure we've already had meta-discussions about this regarding the general TES series, so this is going to be based on ESO specifically. I usually like going either Altmer (obligatory master race comment) or the natural inhabitant of whatever province the TES game I'm playing is based in. The latter obviously isn't going to work for ESO.
If you had to deem one the worst (or your least favorite), which do you choose?
Tough choice between Khajiit and Argonian for me... Can't stand looking at either for extended periods. When it comes down to it, at least Khajiits can have the "lol furry" factor, so Argonian it is.
Sorry hemidactylus lovers.