Blowfish is just slightly more emotional I think. Homer giving Bart advice, jamming with lisa, wanting to be "intamit" with Marge are all very sweet, unselfish things to want to do with your family before death. Homers decision not to worry the kids is I feel a wise choice.
Substitute has a really good guest character. I'll never forget the singing dork. But it's a tiny bit lower in my opinion. Probably the 2 best of their season at any rate, would happily rewatch either.