What`s the diffrence?

I know that there is 2 ways to add command with:

PHP:

if(strtolower($command->getName()) === "cmd"){
}


and

PHP:

switch($command->getName()){
   case "cmd":
}


What's better?

I personally think the bottom one is better. Just depends as long as it works. I guess

If you are doing one command it doesn't matter. Both are roughly the same. If you are matching several commands, the second one looks slightly better.

Actually it is "handle comamnds" not "add commands".

I think the second one is easier to handle multiple whole commands (like /defgm or /time), and to be able to function both at once.
Doesn't exactly matter for one command.

http://stackoverflow.com/questions/3399755/if-versus-switch

About the premature optimization thing, I am paranoid at it. I believe that everything should be optimized since you don't know whether it will get called million times per second one day.

In a commercial setting you don't do premature optimization. A lot of times is cheaper to buy bigger hardware to solve performance problems than pay for a programmer to optimize code.

But I just love optimizing it It is my hobby xD