What is better for security? WPA2 or Access control

I have a Airport express and 2 computers; a Mac and a PC.
When it come to securing your wi-fi connection so you don't get unauthorized clients on your network.
What is better
A- Just using encryption like WPA2 or some other password based system or
B- Just entering the "Airport ID" (MAC) of the computers I want to authorize in my network on the Access control panel.
Seems to me like the later is easier on the clients since they don't need a password or anything, It's completely transparent for the client. And I believe encryption slows down the connection a bit and create overhead for the computer. But maybe I don't have the full picture of the situation.
Is there anybody who can illuminated this subject for me?
thanks
PowerBookG4 Mac OS X (10.3.9)

WPA2 is virtually uncrackable only really vulnerable if you use a real word as a password.
When using access control, MAC addresses are sent unecrypted can be read and spoofed and therefore do not add any security.
Unfortunately "Closed" networks, MAC access control lists, and reduction in transmission power are all more "feel good" security rather than real security. All these various approaches are dated and mistakenly lead to overconfidence.
WPA is your friend if you value wireless security.

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