In my experience the more $$$ you spend on a critter dooms it to die in
direct proportion. So, freshwater.
Also, I think that while I serve the tank- feeding time, water changes, testing, those little chores we do- the tank should serve me in many more ways. You know what I mean: gazing at your Happy Tank, watching the fish eating... You should get many more hours of enjoyment out of it than what you put into it.
I will NOT be a slave to a saltwater tank. ("Amen").
I will NOT have my life revolve around testing, monitoring, adjusting... worrying. ("Halleluhiah").
I will NOT go broke providing expensive lighting to keep a rock alive or whatever. (Faint).
And, to conclude, it is better to have a large source of fresh water in your house in case of emergency.
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(BTW, I burn with envy when I gaze upon those gorgeous Marine aquariums...

).