Some of this depends on your group. How many do you have? What ages?

With cars I am for enough for each child to have one as they often play that together or will race eachother. We have a ton of play kitchen food but organize it by food group so it stays pretty organized.

I like the less is more approach but almost always strive for enough for each child to have one at min so if they want to all play with one at the same time they can but then rote what is out. i.e. I may enough cars for all on Monday then the cars go away and I will have enough play silks for all on Tuesdayout. Naturally this is not always possible (due to size/storage space).

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