which one do you prefer CPU miners and GPU miners?

[dindasulis]

Mining rigs fall into 2 main categories: CPU miners and GPU miners.
1. A CPU miner uses the computer's central processor to do the mining and so powerful processor will give you more mining power.
2. A GPU miner uses the graphics card for mining, so the central processor really only has to run the operating system and mining software, and requires little processing power.

which one do you prefer CPU miners and GPU miners and the reason why?