Years back we fussed over the shape of tips and the thicknes of edges and sharp vs rounded LE on n on
Once we finally had time to do purely objective comparisons we found most of these "facts" including trick turbulaors and such were mostly just wistful thinking
The typical small glo engined models were never light enough - and when it was all said n done - only two things were really worthwhile

make it lighter if any choice is presented
keep it as stiff as possible without adding weight

Once you get down to slower smaller models - the entire model can just be flat slabs -if you can keep the weight off.
Don't believe it?
buy some 1/2" thick EPP an make some models -in say 400-600 sq in range - make things as sharp or rounded as you want - - the differences ?
you tell me.