Well lets see, we have a saltwater tank and i love it. I personally think is is better that freshwater. And the costs of one depends all on what you want to have. For example a large reef tank with lots of corals and fish is going to be more work and money than say a fish only with live rock. Once you get it up and the way you want it its not hard at all. All you would need to do is water changes, testing, and adding minerals if needed. I think that most people are discouraged about saltwater tanks because of the price of things. But if you like what you are doing its not that bad. We have invested alot of money into our tank, and i dont regret any of it. Its very relaxing and enjoying. Like our little piece of the ocean.