Error when Using #define to set pins

Thank you, guys!

I don't currently have a memory problem; I'm just very conscious of the amount of memory I'm using. I saw some passing references to #define and thought it might be advantageous to use it. If I had paused to think, I would have remembered that using "const" accomplishes the same thing (in regard to memory) although this brings me to my next question!

When and why would I use #define instead of const "type" to declare variables? Is the #define a relic and using const "type" always the better choice?