ill be the second to say that its easier to me once cycled and stablilzed and your have your routine down. ive had freshwater most of my life and recently did a sw conversion on one of my tanks and now im going sw with all 4 of my tanks.
fw to me got a little boring after having owned pretty much one of every fish you can get other than discus' and angels. i could also not touch my tanks for weeks and they would stay crystal clear and perfectly stable with IMO was what made it kinda boring after this long.
i did research for a LONG time about 6mo of following threads, starting threads and asking all the dumb questions, reading plenty of articles and write ups on fish, corals, water chemistry, ecosystems and coexsistance of life in a sw tank etc etc. the more you know the easier it will be for you when you actually do the change.
and ill be the one to say, its as expensive as you make it. if you want a 500g reef, get ready to tap into your retirement lol if you want a 125g again be ready to drop some serious cash on serious equipment. but on the other hand if you want a 20g long nano reef, or 40g breeder reef, its very reasonably priced believe it or not, you dont have to go with an expensive refugium or canister setup, its also easier on the wallet if you dont, but to each his own.
im all for sw now and im definitely an advocate for it, ive helped quite a few of my family members startup tanks and a few friends and coworkers as well, and now theyre goo goo for aquaria and theyre really into it. but now pushing for a sw conversion for them lol