I have an aero ace and I can't decide which plane i should get next. I have narrow my search down to 2 planes

What plane should I go with? and why?
Thanks

Without a doubt... SUPER CUB! I went from the Aero Ace and my 13 year old son went from the Aero Ace directly to the Super cub! You WONT be dissapointed!!!

I am looking for something a little cheaper and smaller, like under $70 and under 30" wingspan.
But thanks anyways

In all honesty you should skip BOTH planes.
There are many choices out there that give both rudder AND elevator control. Keeping them under 30 inches isn't easy but it can be done.
Is price a consideration? Or simply size? If you don't mind spending a little extra, the Global Wattage Cessna 180 is a three-channel plane that's an absolute blast to fly, has excellent electronics (27 mhz, but use standard servos), and fits your size requirements. It's a very stable, docile beginner's plane that flies very well.
Flyer

For about $70 you can get the FlyZone Red Hawk. A 3 channel RTF that looks something like the aerobird Challenger. I like the Challenger better but for the money I think the Red Hawk is a better value than the Scout.

$70...ok buy half a super cub, it's worth it!