I've used both for a few games today. Both play amazing for me but I do notice Casey breaking more and making plays. Jalen however has something unique in press. Dunno, he just sticks to ppl better. Anyway, those are my thoughts.
Hayward, is a fantastic corner. I have both, and while Ramsey has a heavier hit stick, Hayward in my opinion has better open field instincts than Ramsey. Yes, close to the line or in hard flats Ramsey can be devastating to players, but with space and more open air Hayward just plays so great.
I have found this to be true for the other Master Secondary player in Hyde. Yeah he is a 95 but that guy is awesome in coverage and shows up especially in big nickel when he is playing the free safety spot.