19XX on a real CPS2 board for example will happily let you change the monitor rotation 180° in the settings, because that's an easy thing to do. There's not really a standard for which way you tate your screen, different cabs will be "upside down", so that's handy. It will not let you rotate the monitor 90° because that's a radically different operation.
They might seem the same at first, but they're not.
If you're looking for a more MAME-like experience, where you can freely change through games at will and the monitor rotation doesn't matter you need to work with digital out to a high rez screen. None of these products transform your 15khz jamma monitor into that. (And has been noted, even if they somehow could, the resulting picture quality would be pretty garbage looking, and beside the entire point of going through all the trouble of having games on a cab in the first place.)