Rolando,
Between the two skimmers, I would go with the XP1000SSS. It is a much nicer skimmer and also takes the least amount of space.
Also, if you were to compare the pump of the XP1000SSS (Bubble Blaster 1000) and the pump of a NWB-110 (Aquatrance 1000), the Bubble Blaster is a much better pump. It draws more air and has higher water flow. It will allow your skimmer to process more water than the Aquatrance would.
Also, the Bubble Blaster pump comes with a 3-year warranty while the Aquatrance comes with a 2-year one.
HTH,
Carlos
CoralVue