More power. But, watts are not everything, high current amperage is.
Typically a amp that can work at low impedance's is much better than one that is only rated at 8 ohms. So look for a amp that produces more power down to 4 or even better 2 ohms.
If you are looking for a great amp on a budget, look for Yamaha. They are great amps, sound great with high current low impedance drive capability. And are typically bulletproof, and will last a very long time.