There is currently no Stitch. The O'hana breakfast is $25 because there are no characters. So it is much cheaper than Topolino because there are four characters at Topolino right now - Mickey, Minnie, Donald and Daisy.
The food is good at O'hana and I love the atmosphere there (and it is currently less expensive), but Topolino has fantastic food and it is a lot of fun with the characters. I would go for Topolino unless Stitch returns by April 8th.