Never played Seminole in a really stiff breeze and 17/18 were still tough.
#6 in Dan Jenkins' book from 1967 as one of America's 18 best. I made par four (two good shots, though) so, perhaps, it has slipped a little given my (non) skill level. I was a little surprised that the inward nine Par 5's played rather short although the wind was not so stiff and not directly off the ocean.
Regardless, Seminole, like NGLA, Cypress, Fishers, PV, TOC, Merion, Garden City, Maidstone et all, is a marvelous golf PLACE. I could play it every day.
Some folks say National is also "easy". If there's little/no breeze, you know the course well enough to think correctly and you have a superb short game, you'll probably score better there than at Shinnecock, Merion, PV, etc.
On the other hand, I know all about NOT having a great short game and about playing National in a stiff wind. Counter-intuitively, the Inward Nine is just as challenging DOWN wind because getting the ball to stop near the hole - especially a front hole location - is next to impossible on 6 of the nine greens.
Neither Seminole or National (or Fishers, The Creek) is "easy" if you don't have game.
Because the greens are generally less challenging, Maidstone might be a few shots easier on a calm day. However, calm days are not the norm on an ocean-side course, so.................