You don't need either to have a successful tank that size.
I have a 20 long in my office and it runs with nothing more than a maxi-jet 1200 to provide flow, and a small sponge on the intake. I have lps and plating montipora in the tank. With sps it's gonna be more about flow and light, but consistent water changes should keep nutrients in line. I change 5g a week, and it takes about 15min with cleaning the glass and siphoning detritus.
I'm planning a new 180 build, and I'm contemplating not running a skimmer, just some filter socks and lots of flow.
Don't get caught up in the equipment race and "needing" this and "needing" that. Maintain quality water, and if you have a problem like high phosphate for example, find out why, not just throw things at the tank until it comes down.
For reference, check out the video below. World Wide Corals runs a large tank with lps and sps with no skimmer.