Since a queen sized bed is of a rather large size, but not too big, a one piece queen box spring will need to be quite sturdy and strong. Enough to properly support a queen mattress plus the weight of the sleeping individuals on top of the mattress. Since the average box spring is made of wood, perhaps some metal straps and/or springs and material the frame for a one-piece must be provide sufficient support. On the other hand for a two-piece unit, there is more support offered around the edges as well as in the middle so the construction will be different.
Due to the need of changing needs and wants, most manufacturer's today offer each height so that your choices for a bed are almost unlimited. If you are considering a low profile option, ensure that the quality of construction will meet the needs the queen box spring will be used for. You may want to choose a two-piece box spring set for more durability and strength.
US-Mattress not only carries the Clearance Beautyrest Recharge World Class Low Profile Queen Box Spring - Foundation OVMB041625, but also has the best prices on all Mattress from Simmons.