I like both of them but will reserve my final judgment 'til I've had more experience.
In the new 6-player-game we just started, we have two Dragonborn and one Tiefling (dwarf, half-elf and halfling making up the rest). I - as DM - ususally prefer more humanocentric games, but have decided to let the players try out the new options to their hearts' delight. Let's see how long they are satisifed with the new races.
I, for one, am not missing the gnome and the half-orc. Gnomes have never been attractive and the two half-orcs I experienced in 3.x were very clichéd.
And for the record: I started playing and mostly DMing 25 years ago; all of my players but one have at least 12 years experience as well.
Huldvoll
Jan van Leyden