I prefer 2 tents that are 2 x 4 than my 4 x 4. Training plants in a 4 x 4 is hard when you are giant and have to reach 4 feet to do stuff.
2 tents that are 2 x 4 give you more options for strains and staggering growth (4 or 6 weeks apart) And you have a dryer always ready.
I love my tents. I am running 2 that are smaller and it is easy to get stuff adjusted (top/super crop lst etc)
But i would fire up the 4 x 4 if i had a spot for it. I will use that for landrace sativas (2 of them) and then just grow everything else in the 2 smaller ones. I love the options. and i have lights for 4 tents so the future may end up with a 2 x 4 to go with my other 3. 1 plant in each sounds like winning in a 4 plant limit
All of this being said i still REALLY like that secret jardin lodge tent that is 9 x 4 x 6 1/2 feet. Seperate veg part within the tent....very nice.
Growing indoors......its in tents....