I may be wrong but I think there are basically 3 wings:Trying to get my head around how fluted vs. non fluted would honestly differ
Standard wings to pull in template so tail sinks, etc.
Wing with flute, MR style, adds bite when on rail. Like a rail channel and you can feel it.
E-wing a full step cut out on bottom allowing to tip over on rail more.
-I am sure there are more benefits that I didn't include
I have never had an E-wing but want to try. Stu Kenson features some nice examples on instagram, usually combined with twinzers.