I started to answer "forward swept" but changed my mind - although "forward swept" would be the closest to my preferences.
I like rockets to be more "unconventional" in configuration. Not to the point of being "odd-rocs", but lets say like fin-tube combos, multi-angle fins, multiple sets of fins, and more than just 3 or 4 fins (why not 5 or 6 small ones?) "Forward swept" would fall into a broader category of "unconventional" that I prefer.
To take it a step further - I build a rocket because it has a cool factor for me. Whatever that factor is, it's there in every rocket I choose to build. It could be a simple 3 or 4 FNC but with great artwork (decals) and nostalgic value. It could be a great looking "unconventional" rocket. I think the high altitude stuff is "cool", but for me I have to be looking for a rocket for that purpose. I generally pic rockets that are "cool" for looks primarily.
If the center of area of the fin is not (at least axially) in the exact same location as the midpoint of the root chord of said fin, that fin is swept (with the determination of "forward" or "rearward" made upon the relation of said fin's center of area's location relative to the midpoint of the root chord.)
The peremeter shape of the fin is irrelevant, however it *may* complicate the computation of the center of area.
I voted for normal though forecheck encapsulated my Fin thoughts pretty much. I also like the tubers and models that look "cool". And as others have also voiced...I like the fins that keep it flying straight.