Depends where you are. I am in Southern England.
Strawberries are available year round - we get them from Morocco and Spain outside the summer. They do taste differently and during the off season are less reliably red all over.
Thus I will buy them only in the Summer.
Prices also change over the year.
I had an interesting conversation with my mom recently when she said don't buy apples. It isn't in season right now. And I didn't know what to say because I didn't even know apples had a season. I just bought the bag of gala apples without much thought to it.
I don't get snobby about food very often, but I have to say that these days strawberries and tomatoes are things I never buy any more.
They're so large, watery, and tasteless, that I grow them myself or go without.
A lot of foods are no longer seasonal, as noted above, but I can't say I can taste the difference. Except for tomatoes and strawberries where I think I can - who knows, maybe I'm imagining it?