I think Ray has a sort of "Reed Richards" position in the DCU, in that he's kind of the go to guy for anything science related that anyone has to face. The benchmark, so to speak.
His incredible feats aren't as consistent - a time machine here, cracking 853rd century tech there, but there aren't a huge wealth of them - but I still think he takes it, intellectually.
Fight wise, he absolutely wins. He can go much, much smaller than Janet or Hank, and can shift his weight/density as much as he wants. His shrinking tech is far more advanced.