Aye, not to be a jerk about it, but the only reason TO use a light dome is because you don't feel like using SS. Or vice versa. Sometimes SS drives render times into oblivion, and without premium settings SS isn't much better than a light dome can get... Although light domes hit objects from multiple angles, they are generally a soft-shadows technique or a "global illumination" technique. You honestly don't need 73 of them really, but it's your render! Try it all, learn as much as you can...