I love Hardin's Mini. In a "trade" 1 gallon pot (maybe 3 liters of soil) it gets 12" (30 cm) tall. It has determinate growth but produces forever. Really, forever. I had some outside last year that got Septoria (everything did) and kept going, leaves or no leaves. At frost, I brought them in. Under lights, they just kept going. The plants are on their last legs now but still continuing to produce.
The taste is good, strong, somewhat tart buffered by a bit of sweet; flavor is complex with depth.
The biggest drawback is the small size of the plant. You get 3-4 stems about 12" long. They produce like mad, but it's still only so many tomatoes at a time. I'd suggest for you to put several in a 3 gallon pot and see what you think.
Fruit is about 1" long, some bigger, some smaller, oval, pointed, red. I have a few extra seeds if you would like them. (Not a general offer; supply is limited.)
I'm trying to create that same taste in a full-sized fruit on a larger plant.
Nan