Hob Chpmnk wing lightning?
less drag. It is very aerobatic as is, will loop,roll,spin,invert,snap,avalanch, etc. with stock wing. It won't change the stability noticeably. It will fly faster, corner more nimbly, land better- but make sure you can slow the engine or it will keep flying- even with stock wing!
inverted will still be fine, especially if you sand a little phillips entry into bottom; like seniorita or full size cubs have. I also reflex the ailerons slightly, negates trim change at different throttle settings on flat bottom stuff.
The starfighter is totally flat on the bottom, flies inverted just fine. I just personally find that a flat bottom works better on airplanes .15 size or less. over that, it doesn't work the same. on .25 size or larger, I get the same results using a laminar airfoil. only difference there is that below a certain speed, it sinks rapidly w/ laminar.