The stucco wall would match the house but I worry about how much room there is to move around the equipment with how close the wall will need to be to it due to how close that spa will be. A pretty lattice wall will be thinner and provide good air flow around the equipment. Inside the equipment area I would put down a GOOD weed block and a solid "floor" of stepping stones then large rocks like river rock all around the equipment its self. It will be a pain getting the weed block in there but it will be well worth the effort to keep the weeds and such out. I would use "lawn staples" to help hold it down in there as well.