I am looking to change my brake rotors the cross drilled and slotted ones and my question is there are some that say they are for cars with performance suspension and some that say they are for cars with regular suspension. What is the difference?

 

Size. Sport suspension has larger front rotors.

"Performance rotors" are a waste of money unless you reduce unspring weight by getting lightweight two-piece rotors. Drilled, slotted etc means nothing and usually you're getting an inferior product to OEM blank rotors. Stick to OEM or if you want a true performance rotor get something like Racing Brake two-piece or DBA 5000.

Shameless plug.. I happen to have some for sale:
https://www.rx8club.com/rx-8-parts-sale-wanted-44/racing-brake-2-piece-slotted-rotors-229932/