At yr level I doubt wether you would notice much diffference between the two.... most plane of that type have fairly similar flight characteristics as they have all been designed to do the same thing! Im gonna go with what some of the others have already said, the sig somethin extra is a great plane to build and fly. The quality of the kit is outstanding, all the parts are laser cut so you can be sure it all fits together precisely. If you devote yrself to it you can put it all together in 1-2 weeks. It is well capable of all manouvres yr likely to do in the near future and it doesnt cost stupid amounts of cash!