I have Stella, Balaton, Surefire and am in zone 6/7. I love Stella, but if there is too much rain the cherries get rain rot. Balaton is great, like Montmorency. Surefire is not doing well for me, but I blame it on the rootstock, had it been a standard cherry rootstock like mahaleb it would have been fine. Gisela won't grow in my soil.