B. gehrtii is a good houseplant, likes cool growing conditions, is rhizomatous, so you will have to watch the watering, and no direct sun, just indirect light. I think y ou mean B. plebeja for the other one, it is a common, popular begonia ,a species from Central America,might be sizey if it prospers,probably appreciates good humidity. Ive never heard of 'mariti', is that name correct? The last 'Paul Hernandez' is another popular begonia in ABS, I don't know how to grow it, I've just heard of it. Hope this helps.Yes, all can grow indoors.

Thank you for the suggestions.
B. gehrtii looks good now, although i let is get some filter afternoon sunlight. It has 3 new leafs growing up now.
Sorry about typo, it should be. Begonia peltata.. It looks just okay indoor. Although it has some new grow leaves, old leaves look dried.
Begonia Mariti is right name, just find one paragraph about it. It is on ABS website. It looks okay indoor, not really happy but not sad either.
I saw some B. paul hernandez that is growing in San Francisco Botanical Garden, so I think it should be okay at outdoor in SF. I have it at outdoor now.