You could squeeze two photos in that space if you wanted to, but I think it's probably a better plan to do one of each. My plants typically take up 2 square feet each. That's about 17 x 17 inches. They'll yield about 2 ounces, easily, at that size. When I first started, I ran three NL autos and yielded quite well. I like autos. I wish I lived on a farmstead - I'd grow a whole batch of 'em in the summer!
Graytail, my auto jock horrors from nirvana yielded great! I used them as my CS seed experiment. im growing out 2 of the 3 different auto mixes i made. Actually 2. I pollenated the JH herself too. I like autos for speed and variety