I've never owned a carpet cleaner only a spot cleaner before but this one is so easy to use, far easier than a rug doctor, carpet dries quickly because you can use the dry only mode and because all the liquid tanks are separate it's easy to manage.
The bissel spot cleaner I had was basically just a water vac and sprayer and you'd have been better off with a wet/dry vac and a soap spray bottle. Glad I've got this anyway