indica will only finish "potentially" faster than sativia. All plants start to stretch and flower when sexually matured and given time time and light to do so. (Outdoors most people don't get down to 12/12, so I'm going to treat your post like a light post for 12/12 lol)
Your indica plants will finish possibly faster than your sativia by a few weeks? but they generally start bidding the same times
indica will not yield less, if you're doing well with sativia you might even get better more dense bud. I thought you said auto when I first responded because autos are a smaller yield usually. And mould resistance is better lol
When it come s to indica or sativia for mould resistance; youbhave to look at the strain. Indica is just the other type of high, the shorter, faster "finishing"plants but all plants start when they are mature. Autos are the only ones you can get a harvest out of in 3-4 months with minimal effort and noblught changes.