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jackc-
I alternate, because I get bored easily - I usually do them when I'm doing a different bench exercise, so that I'm not just sitting around.
For the sitting, I have a set of dumbbells on my knees, and do one leg at a time.
Standing, I grab a step / bumper weight, and use the wall to occasionally steady against. Also, one leg at a time, so that I can make sure each leg does the work.
NotThamesWater
They hit different muscles. I do one after the other.