I don't know. I find human characters so tear-inducingly boring that I can't even play through the origin for curiosity's sake. I found the Human Noble Origin just insufferably bland, cliched, and filled with more boot-licking for Couslands than I ever want to see for one character. I found the Human Mage less insufferable but even more bland and boring. It's the same origin as an Elven Mage, so it's less exotic and neat. The way I see it, why just have magic when you can have the added bonus of being an exotic race with the added discrimination and cultural heritage of being an elf?
As a people, culture, history, socio-economic position in the world, etc. I relate to elves more. Their history, culture, socio-economic position, etc. has shades in common with many Jewish people, especially pre-WWII European Jews. (Along with people of Celtic, African, Native American, Romani descent, etc.) It's the cultural identity I grew up with, thus the characters I relate to the most. (Plus they're lithe and pointy-eared, like me.)
I never want to hear "We all relate to human characters more because they're human just like us, and anyone who says differently is lying," because I don't. I find the humans of Thedas have the same W.A.S.P. (Wealthy Anglo-Saxon Protestant) culture as our boring European Christian-descended Western culture, which I never understood, never felt at home in, and never belonged in. Plus I was socially awkward and heavily bullied growing up, so I never automatically felt like I related to or belonged among people just because they happened to be the same species as me. I prefer being around animals and nature in real life, and I prefer the cultural identity and values of elves in this game.
It all comes down to personal preference. I don't know what or why yours is, but I know mine.