PWM Motor speed control using PIC; What mosfet to use
In order to compare two MOSFETs, a \$Q_{g}\cdot{}R_{ds(on)}\$ figure of merit is typically used. This will give you a rough idea of how good a MOSFET is for switching application. You will get both \$Q_{g}\$ and \$R_{ds(on)}\$ in the datasheets.