y'know any ratio is good really
i'd suggest you take a few same sized blobs of each and just record what you're doing and knead it till you get what you like
start with one of each--see how you like that -- does it make nice ruffles yet
add one or the other blob see how you like it does it make nice ruffles yet
play with it
me~~i'd do a bit more fondant than chococlay 3-2 or something maybe 2-1 ish
you might want to add cornstarch (or tylose) or a tad of shortening to smoothy smooth it out
i've mixed all three before, f, cc & gp
play a bit
but i would err on the side of more edible and crunchy on the outside and chewy/chewable on the inside--in other words i would not use gum paste--but somebody else might
but for those exact ruffles maybe a bit different ratio is best for you than me in your distinct barometric pressure and humidity and moisture content of fondant and the other 10,000 variables
and you wanna make sure it's gonna adhere well too