floide, I think you should experiment a bit for yourself and see.
Your original question was essentially asking "what's the difference?" And I'd guess there is a good chance you will perceive a difference.
You might find (as I do) that it's preferable to add a bit of weight, but still keep the racquet strung fairly tight. The added mass seems to help increase power and stability, but I don't feel that control is sacrificed.
I've strung rather low before as well, and while it can feel comfortable, and after a time, I'm able to adjust, it doesn't feel equivalent (to me) to adding weight to the racquet. I feel like shots "spray" a bit more with the lower tensions.
It's worth experimenting for yourself and seeing what setup is comfortable for you.