There are lots of strains that produce large amounts out there these days few things you need to look at .....
1...Room height and size
2...How much space has each plant got
3...Light
4...Pot size
So what you get from a plant has many many factors. As a general rule with all the crosses on the market now days to get 8 to 10 week flower times you need to pick the Indica Dominent strain. Most of the time the more Sativa in it the longer the flower times. Experience is a must to get the biggest yield in any area
IMO you have to settle for a in between strain cause one thing growing quantity other is getting rid of it which will be hard to do so even tho a strain is 800 grams per m2 80 percent of the growers will never achieve it your best bet is to do a engine search for commercial growers Hi yielding strains there are lots of them
Critical mass is supposed to be a "rework" of the original big bud, My understanding its that the line is bred from the same original parent stock, but selected differently, mainly for better potency. IE, they aren't "quite" the same thing, though they are related.
Never tried either, but the original "big bud" goes back a LONG time, at least to the late 1980s, if not older than that, and its known for two things: Super-high yield, and low potency.
Supposedly the critical mass rework is more potent. Its probably a great strain to grow if you care more about quantity than quality.
Here are my picks for strains
Purple kush
Big Bang
Skunk 1
pure power
m39
northern lights
chem dog