From Longman Dictionary of Contemporary Englishbe a matter of (personal) taste/choice/preferencebe a matter of (personal) taste/choice/preferenceused to say that different people like different things I can’t say which wine is best – it’s a matter of personal taste. → matter
Examples from the Corpus
be a matter of (personal) taste/choice/preference• The amount of the increase or decrease is a matter of preference.• The first is a matter of taste.• In the United States, food is a matter of taste, time and price.• Quite what that means is a matter of taste, because a breed does not exist until it has been named.• The size of the pleat is a matter of choice.• If you think torturing babies is good, that is a matter of taste.• This is a matter of choice.• Switching to the Normal channel I would say that using the crunch option for rock solo work is a matter of taste. 