Even though the wattages are similar there is a big difference between a point source light and a fluorescent light. This is why the watts/gallon rule does not apply in reef tanks. the 150 watt MH bulb over the solana should be sufficient for sps assuming it is providing sufficient PAR, which I haven't seen anyone measure the output yet from that particular fixture/bulb combo.
Now in the RSM tank, you don't quite have the intensity for SPS, although one might get away with hydnophora (some consider this an LPS), and Montipora. Both of these I have grown under PC's back in the day and had no problems and got good growth and poor coloration.
AFA as comparing the systems, I wouldn't really consider the skimmer on either setup to be "good." One of the reasons I'm not a big fan of these all in one setups is you sacrifice a lot filtration-wise when you pack everything into a small chamber on the back. the Current unit does have a cool little auto top off feature, although it too is so small I don't think it would hold much more than a day or half a days worth of water.