We were wiped out by late blight our first year planting tomatoes. We were shocked that it took less than 3 days to lose everything.
The following year we decided to grow only disease resistant. Defiant and Matts wild cherry were 2 of about 5 choices of plants. (year 2014 was our first planting of defiant) The very first time we planted defiants, we had a huge crop. We couldnt keep up with some 20 or so plants. Other varieties were skimpy, or cracked because of heat. We tried a lot of variteties, including cherokee purple, brandywine, others. Another interesting point is that whether or not its too went or too hot, the defiants always give us a crop. Defiants always came through and now we plant them every year, including this year (2017) and we are confident we will always have tomatoes. 2016 we were picking still in August. The tomato is really quite good, having a orange red color when ripe, oftentimes having streaks of orange on the shoulders.
Matts Wild cherry are also very good and very reliable - and literally, they grow like a ****. We are trying Damsels this year and Caiman - both Late Blight resistant, just to experiment.