Every airport transfer asks you to pick one, usually with no explanation. Here is what each one actually means on the ground at LAX.
Curbside
You land, clear the terminal, walk out to the arrivals level, and the car meets you at a numbered door. The driver is tracking your flight and waits in the holding lot until you text or call. It is included in the fare and it is the right choice for most trips.
Meet & greet
The driver parks, comes inside, and waits at baggage claim with a name board. You are met before you have to work out which door you need. It costs the parking fee the chauffeur actually incurs while waiting — which is why it is a separate line rather than baked into every fare.
When it is worth it
International arrivals. Bradley clears into a single crowded hall and the curb is a long way through an unfamiliar building after a long flight.
Anyone travelling alone who you want met. A parent, a child flying unaccompanied, a client you have never met. A name board removes the phone call entirely.
Heavy luggage or a group. Four people and six bags do not navigate an arrivals hall quickly, and curbside at LAX is not a place you get to stand and reorganise.
When it is not
A domestic arrival with carry-on at a terminal you know. Walk out, the car is there, you are gone.