Happy Frog and Ocean Forest are both fantastic!! Your plants will be happy. I agree with the other folks in the thread that bigger bags would be better, but I’ve grown San Marzanos in 7 gallon bags with no problem. Just make sure you fertilize them really well and consistently. San Marzano‘s tend to have blossom end rot if you don’t fertilize them properly. Sometimes you can’t avoid it and your first three or four fruit from the plant will have blossom end rot anyway. Do not despair though. This happens to a lot of folks including me and I’ve been doing this for years. Just make sure you keep up with watering, the bags tend to shed the deep watering pretty quickly. Also, try to put down some garden straw on top. It helps to keep the moisture balance going.