600 watt vs 1000 watt?

With the same number of plants only doing 30 and not putting like 10 under each light, Im thinking 7 1000 watters with 4 plants under each, or like 10 600 watters, will I see a big difference, im thinking with 7 1000s I would get around 7 pounds, and with 10 600s like 5-6 pounds, what people think

You can easily get a pound from a 600 if you know what you're doing. I'm partial to 600's and think it's easier to yield well with one verses a 1000. JMO.

I got 600s and 400s covers up more area