The early pylon was a displacement vs area formula. And the winner in 1958 or so was a conventional design.

If the delta planform held any performance advantage, the Germans would be using them in their speed competitions. They don't.

Making lift and an anti-pitching moment with one airfoil does not lend itself to good drag polars.

The one area that delta planforms do well is landing. Easy to operate at a high angle of attack without falling off in a stall, makes landing easy. A clean conventional speed design takes much more pilot skill in landing.