I am not sure what you mean by "height control"?
I can tell you that coilovers will be much stiffer than most spring replacements. I can also tell you that if you replace the springs with stiffer ones you should replace the shockers with higher rated ones to match the new springs, sometimes a difficult thing to achieve. Generally I think coilovers offer a higher level of performance and of course offer height and damping adjustability, but the will probably cost you more, perhaps twice as much, as a set of springs.
As for brands, I might be a little biased
