The way I see it you have Dwarf > Goblin > Kobold > Gnome > Halfling.
Amusingly, my take on preference for races to play as I find interesting and enjoyable is, from those listed five at least: Halfling > Gnome > Kobold > Goblin > Dwarf. That's outside of mechanics, but just purely in the sense of being interesting and enjoyable to play as, for me.
