of (one's) choice
As chosen or desired by oneself, among all the options. My parents took me to the animal shelter and told me I could have the puppy of my choice.
of choice
Preferred above others, as in A strike is the union's weapon of choice. Used with other prepositions ( by, for, with), all meaning "by preference," this idiom dates from about 1300.
of ˈchoice (for somebody/something)
(used after a noun) that is chosen by a particular group of people or for a particular purpose: It’s the software of choice for business use.of your ˈchoice
that you choose yourself: First prize will be a meal for two at the restaurant of your choice. of choice
Preferred above others of the same kind or set: "the much used leveraged buyout as the weapon of choice" (Alison Leigh Cowan).