Hmm well, Subrosian, Lokomo, and Twili are a definite out because they werent a recurring race(for now). Shiekah are too backgroundish for me, I don't feel enough explanation of them. Rito are a debate with the Zora so I can't choose either one.
My final decision would be the Hylians because they are most recurring races in the game since the player oftens sees one and talks to the Hylian. Goron, Deku and Kokiri are more of "extra service" to the Hylians due to these following reasons:
1. The Deku often help Link out with any supplies that he needs since Link reflects the Deku Nuts back at them. The Deku can be referred to by enemies, but after the first Deku Scrub you beat in The Minish Cap had me thinking that they aren't so bad since they tend to "talk with their mouth full."
2. The Kokiri helped raise Link in Ocarina of Time to become a strong lad. They had a shop full of items that apparently would have been of use to Link only.
3. Gorons can be brutal but usually getting helped by the Hylian, they reveal a softer side and act as if Link is one of them, which helps Link go and supply himself with shops and access to other places like the Dodongo's Cavern in OOT and the Goron Mines in TP.