" I am trying San Marzano and it sets lots of tomatoes already!"
Early set of tomatoes - now THAT is music to my ears !!
I'm actually hoping to replace Juliet with Riesentraube, which I've grown a couple of times in the past and they were quite similar and perhaps marginally better (a bit thinner skinned, and got some rave reviews about the flavor). If they produce well for me again this year, then likely I won't grow Juliet again. Similarly, I keep looking for a replacement for Viva -- it seems to always be the first to get hit by whatever disease gets to my tomatoes every year (I believe it is either fusarium or verticillium wilt); probably because they are determinate and aren't able to "outgrow" the dying off of the lower leaves and branches. Hopefully San Marzano and/or SM Redorta will be the one ! (or, if not, I'll just keep looking and trying...)