Every year, I plant a number of tomato sets in hopes of generating a crop of fruit come 'high summer'. I have pretty much got it down to six spots where I can put in a plant set each year, so I'm limited to the types I can get. I always shoot for at least one, if not two, Roma tomato plants. Then, I perpetually looking for a decent producing slicer with a 'snappy' flavor, so I always have a couple of slicers. I've come to appreciate pear tomatoes for snacking, so I usually have one of those. Which leaves me one spot to 'sample' with...heirlooms, new introductions, other claimants to the whole slicer search.
My biggest problem: my hens. The girls don't do any directed damage to the plants, even though I have to protect them from trampling, like I do so many other plants in the back garden, but once the tomato set fruit...they'll go for the red. Every time. I have to cage and net my tomatoes.
I'm currently trialing fertilizing the tomato spots by placing plastic planter pots (holes in the bottom, y'know) filled with the scrapings from the chook chalet floor after cleanouts, on each designated tomato planting spot.
I have found tomatoes to be an unreliable producer, highly dependent upon the seasonal conditions. A cool and cloudy summer leads to smaller and fewer fruit. Bad enough and it gets labeled a 'green tomato summer'; an undesirable outcome, but one usually outside your control. A warm and sunny summer produces more fruit, provided the plants are adequately watered. Tomatoes are not really a northern latitude crop, but can be done with things like cold frames, greenhouses and hydroponics, or an extremely fortuitous climatic event.