Back in the early 1990's, Edge was an American company that manufactured an after-market wing . I think it cost about $80k back then. You would buy one and retro fit it to your Laser200. This was essentially the only American made unlimited class aerobatic airplane. The 540 refers to the IO540 Lycoming engine. It is a huge six cylinder aircraft engine. I'm not certain if/when Edge began manufacturing entire airplanes, but I think they do.

As for the Extra, that is a German airplane company. The 260, 300, and 330 refer to the various Continental engines used and the various wing locations, low vs. mid.

As was mentioned, both airplanes are very similar. The Edge design iseasily a decade newer and incorporates somemore desirable geometry, namely the straighter leading edge. Less snappy when you want to yank up hard on it. And the mid wing geometry is optimal.

As for the models, well, any advantage the real Edge might have over the Extra is often lost is translation.