Row 13 probably has the most legroom but row one is good too if you don't mind not having underseat storage in front of you and the tray table in the armrest. Even their regular seats are fine for me and I'm six feet tall but not very picky when it comes to airlines. Viva Aerobus is a different story. Seats are packed in like sardines on their planes.

Just make sure you know Volaris' rules before flying and check your itinerary to make sure they don't make any changes. They aren't bad at all IMO.