Both look to have the green flesh gene (black tomatoes), yellow skin, oblate fruit and fasciated fruit (beefsteak locule pattern) and regular leaves. The green stripe gene (gs) is the only visible difference between the two other than degree of red in the flesh so the F1 will resemble Paul Robeson more or less, maybe with very faint striping. The F2 generation will give you approximately 3 non-striped fruit plants for every striped fruit plant. You can grow out a couple of plants in 3"-4" pots over winter under lights to get a little tomato or two for F2 seeds in time to plant them next season. Actually, because you probably have an extended seaon in California, you could start a few seeds now (just clean them off a bit and plant them, but ferment/chemical clean the rest for storage/planting next year) and grow them in 4" pots and get a little fruit or two growing before your season ends. Bring the plants in and grow them on the windowsill until a fruit ripens and use that F2 seed next year. That way next year you can grow the saved-seed F1 hybrid for an eating crop next to F2 plants that you are trying to segregate for whatever characteristics you want to stabilize (stripes, flavor).
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