OK here's what we got

looking at tile or vinyl for the bathroom. current floor is vinyl on
some type of wood floor.

home depot says take the gloss off the vinyl, then mastic, then
backerboard, then mastic then tile

lowe's guy says for vinyl, put down skin coat to fill lines in the
vinyl, then put town self adhering vinyl.

lowe's guy also says for tile, put down a membrance to cover the
vinyl, then mastic, then tile. membrane is moisture barrier and fills
in lines in the vinyl

any comments? Thanks all