evaporust works with enzymes that eat the rust, which is a different process from acids.
Acids eat at the entire surface of the part, dissolving the softer porous rust faster than it dissolves the good hard metal, but still affecting the entire surface.
Rust converters usually change iron oxide (rust) to iron phosphate.
Rust encapsulators only cover up the rust. The idea is to prevent things from contacting the metal so that the rust doesn't get worse.
Each works in it's own way and his advantages/disadvantages. If I had to pick a favorite, I think it would be evaporust, but there are also a lot of parts where the cheap easy acid solution would be a viable alternative.
