Hawlucha is much better. While it has a decent Attack stat and Speed stat, you should make the use of High Jump Kick. It learns it via leveling up. It also learns Sky Attack, which takes a turn to charge up. Just give Hawlucha a Power Herb and you'll be alright. Since you are playing a Generation 6 game, there will be more Electric-types to knock Swanna and Hawlucha out. Swanna has 6 type advantages, while Hawlucha has 7. Swanna has a 4x weakness to Electric-type moves, so that will be a major flaw. Hawlucha does not have a 4x weakness, but still has some weaknesses. So, Hawlucha has better typing than Swanna. It is a good idea to teach your Hawlucha Fly, because he/she is very powerful with Fly. Plus, if you plan to battle with it, Hawlucha will probably win the fight for you! In conclusion, Hawlucha will be the better Flyer for you.