If I had to pick between the Sky Fly 2 or the Aerobird 3, I'd seriously consider just spending my $100 on beer and pizza instead. Pilots frequently report problems with the electronics on both of these planes. You might get lucky and get a good one out of the box, but it's hard enough to learn how to fly an electric park flyer on your own. You'll quickly become frustrated if you don't start out with reliable equipment.

The Super Cub and Ventura already mentioned are both good alternatives. I'd also add the Parkzone Slo-V to your list of alternates to consider. It typically sells for $99 completely ready to fly and is a much better choice than the Sky Fly 2 or the Aerobird 3.

Good luck and good shopping!