The Aero is the more versatile of the two boats, in that it can be sailed well in a huge range of conditions. Yes, in the big picture it's similar to a Laser (which I've sailed too), that is, it's a small single-handed cat rig, but in its details it's clearly superior. It's PY is only a few% lower than a Laser, but of course that represents an average over all conditions. In reality, the greatest speed difference is on a planing reach, where it really flies. It's much more comfortable for hiking, and has eliminated all of the annoying Laser problems, such as the sheet catching on the transom during a gybe. Quick to rig. The sail is far more responsive to controls. Steering is tight. The boom is higher. It's half the weight. I could go on...
As for the RS100. It's good that you've already learned how to sail an asymmetric while on a double-hander. I hadn't, and so had to learn on my own, while playing all the downwind roles, which is not the sequence I would recommend. Compared with a Laser, or an Aero, the 100 is fast, fun, and always challenging downwind. But the conditions matter a lot. I have both boats, and we have a huge range of conditions where I sail. I usually take the 100 as my play toy when the wind is relatively steady and in the range of 8 to 15 knots. In all other conditions, or when I want to practice for racing, I take the Aero. The 100 doesn't have any racing in the U.S., and it appears that it doesn't have a lot elsewhere, so really it's a boat for fun. As for upwind sailing: it's really no faster than an Aero, but generally a bit more work. The 8.4 mainsail on the 100 is pretty big (I'm 75 kg), so while the wings are generous, and quite comfortable for hiking, it's still the usual amount of work upwind, with the downwind as the main reward. It's a bit like skiing without a chair lift. The size of your venue matters as well. Given the limitations on downwind sailing angles, and the speed, the 100 needs a lot more water than the Aero. In short, if it's just for fun, and your venue is good-sized and has decent wind, the 100 would fit the bill. If you want to race, or if it's usually light and shifty where you sail, the Aero is a better choice.
Personally, I think the ideal combination would be to race an Aero and also sail and/or race a double-hander asymmetric with a good, reliable teammate. Ultimately, a single-hander asymmetric is a compromise. To accommodate the chute, and for balance downwind, the mast is set farther aft than it otherwise would be. But there's no jib, so upwind it's a compromised configuration. But, of course, finding that teammate is easier said than done, which is probably why the 100 exists.