I never did FW tanks always had salt but a planted tank really caught my eye think I was at my dentist, and I do not feel Marine tanks are anymore or less expensive, its just a different setup and can be just as easily done in hundreds of different setups, you can have just live sand and live rock, just live rock bare bottom, You can have fish only with a giant wet/dry filter setup, You can have soft corals stony corals tons of fish no fish little fish giant fish, the variations are way too numerous and only limited by your budget, and imagination. If I was to compare dollar to dollar, I spent more on this 100gallon planted than one of my reefs, now mind you I do not have super rare specimins of fish. The most expensive fish I have salt or fresh is my royal pleco.
29g Tetra Tank
100g Planted Angel/Clown Loach
I can't spell...Im an engineer, I do math