False. They're not mutually exclusive and these kinds of things are not one-size-fits-all.

I'm a very few, very close kind of person. But I don't pretend to assume that what works for me is necessarily good for everyone--or anyone--else. My recommendation would be "You decide."

Both.

Few/Close

If you have a few close friends the casual part is covered because you can be casual with anyone.

Sometimes though you need mates, people that know and get you. Someone that can give you a hug or tell you you're wrong about something.

'Casual'friends/acquaintances are akin to fallen leaves in that they are easily blown around by the prevailing breezes, True and Close, Trusted Friends are like pure Diamonds, rich, rare, hard to find and should be cherished.

For me it's not by how many it's by how much we mean for each other
friendship is a realtion like any other kind of realtion (Value) is every thing
it's the real engine of any healthy realition so more we were valued for each other more we will be very close no matter what.

Casual friends makes you go by, but have no meaning. Close friends are the best, but be careful, you may find disappointment in good friends as you do in love relationships.

I think it totally depends on the type of friend you plan to be.

That is strictly a personal decision.