Thiss is my second year growing tomatoes in containers. This year's pcs at various stages are posted in the forum Photo Gallery.
I have siletz, cyril's choice and defiant in 5-gal orange buckets (Home Depot) with two drainage holes 1.5 in from the bottom. Growing media is 1:1:1:1 mixture of peat moss, MG potting soil, compost and perlite; additions were 1 cup Espoma Organic Garden Lime and about 1/3 cup 10-10-10 fertilizer. I water twice a day (three times, when temps go above 85) and fertilize with Jack's Classic water-soluble fertilizer as the plants show they need it (approx. every 2 weeks).
I also have Jasper (the only indeterminate and cherry tomatoe) in an 18-in patio container: same grow media etc.
Then there's my 2 Earthbuckets (self-watering etc) for mountain merit, celebrity, legend and another defiant (for direct comparison of container size). (Another mountain merit is in a 5-gal bucket on a neighboring patio.)
I'm ending this tomato season nesxt week (6 weeks early), so I feel I can draw comparisons now:
Tomatoes from plants (both mountain merit and defiant) are smaller and fewer than those from plants in the Earthbuckets.
Over the winter, I will buy another Earthbucket to replace 2 5-gal bukets.
I haven't decided whether to keep the 3rd 5-gal bucket, but if I do I'll grow another dwarf tomato plant in it and this time stake it with a STOUT PVC pipe!!!