depends, do you have a windows or a linux box? if so go with what ever you have, but LAMP or Windows+IIS etc would be a better option.
They are not Apache servers, they are packages that include Apache. As for which package is better, it all depends what you trying to achieve.
LAMP and WAMP are the same, except on a different platform... I'd go for LAMP tough... But, do you need all the extra's? If not, just install Apache separately?
If this is just for on your PC to test things out, I tried Apache2Triad and it was very easy to install.