Scotts Premium Blend Top Soil question

[Tokin'Tiger]

Just a quick question here, would using this scotts premium blend top soil which is described as

• Premium pre-mixed three-in-one soil blend contains topsoil, compost and manure
• Natural and organic
• Helps retain moisture and improve soil structure
• Contains essential nutrients for healthy plant growth
• Good for in-ground garden or landscape use
• 20 lb bag

be better than me mixing together all those things? And does that soil sound good? I'm going to be growing around 200 masterlow plants in the ground and I am trying to figure out what would be best. I know soil is so important to the grow, so money is not an issue (soil is only like 2 dollars anyway, but im willing to spend whatever, to get a decent grow)

Thanks