Do you switch between things in plural?

Question

I was just now watching a TV programme where a character said "I'm concerned when we switch brands of coffee".
Ignoring the choice of:

switch brands of coffee  // switch coffee brands

Is it correct to say brands (pl.), because to me both the above and:

switch brand of coffee // switch coffee brand

sound fine, or at least, I do hear both. Which is "more correct"?
I can justify either: the sentence speaks of switching to a singular thing, but then it switches between plural things.

StoneyB on hiatus · Accepted Answer

Whether you switch brands or change trains, the idiom is pretty clear:

If the object changed is indeterminate, the plural is overwhelmingly preferred to the singular, by a factor of 25-40 to 1&mdash;doubtless because you are exchanging one brand/train for another.

In the rare case of a determinate object, however&mdash;if you change your train or they switch their brand&mdash;the plural vanishes and the singular rules.

Tsukasa Matsuura · Answer

When you switch something, you need at least two things: A (from which you switch) and B (to which you switch). Therefore "something" should be plural.
See an example in Cambridge Dictionary; 
After the bank robbery, the gang switched cars (= left one car and got into another).
http://dictionary.cambridge.org/dictionary/english/switch

Do you switch between things in plural?

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