RE: Extra vs Edge,,, the why and what's ????
6 of one, half a dozen of the other. Different kits fly different of the same design too. Those two are close enough, you probably won't notice a huge diff. I know that my G-202 from midwest was a total POS compared to my friends goldberg extra. My Edge has a lot more wing and lighter wing loading than the 202 so it will be so much better in the air. The better flyer has a lot to do with how it is built and which kit it is.
The 202 really soured me on midest kits. Have had very few other kits that built that good and flew that bad.
Which kit are you looking at?