Both are good looking tanks as I’m partial to euphyllia style corals myself. When you say time? Anything specific? Glass cleaning ? Water changes? Etc? I’m all for bigger being better but also to an extent. I would like to try to avoid myself regretting going to bigBeen there done that and went back. Had a 180 went to a 310 and today I am back with my old 180. For me maintenance was the issue with time. 180 versus 310 with larger water changes more equipment. I loved the 310, just didn’t like the time it took to keep it. Ended up selling most of my angels in the process of going back to the 180. Definitely do not want to deter you, if you have the time go for it
180 before 310.
310