Hi trabadoor22,
You are certainly looking at some great options and there are many forum members that have purchased one or the other and hopefully they will see your post and share their feedback but in the meantime post #2 here should be helpful.
You can feel any difference in firmness between the sides (which of course the reason for split firmness levels in the first place) but with a suitable quilted cover (which both of them have) you won’t feel the split itself.
Phoenix