Delta wing and Canard vs 'Conventional'

[Pontius Navigator]

I think a lot is to do with design fashions. Remember also the Russians used canard etc on the SU22 (IIRC) and Concordski etc. Swing wing was fashionable before that, AFVG, Fitter etc.

Before that tailless deltas, B58, FD2 etc.

So you might argue that the US are ahead of the game with stealth tail less coming in.