My two cents:
Discounting the
prototypical notched shield, the triangular 'S' emblem is the true original and that's what I voted for. It looks particularly nifty when it's not too big and maintains its streamlined size. I'd suggest as above, but with a red border instead of a yellow border.
Could you post the three designs as you have them in mind?
The triangular logo has the added benefit of not suffering from extreme over usage. The Fleisher logo and the E-2 logo have both been so overused on so many drawings of the "Golden Age Superman" that it isn't funny, especially since neither of those designs was ever actually used in any comic book from the 1930s, 40s, or 50s. The War of the Worlds Elseworlds is one of the few instances I know of where we've seen the triangular logo since the late 1930s:
Even in the above cover, the triangle is too wide and modern.
Bogdanove also used it (see
https://www.supermanthroughtheages.com/tales2/thesuperman/), but he had it much too large for my tastes. Again, too modern.
The best dimension and size would be as it appeared on Superman #1
That's the Golden Age.