Depends....a good expensive processor should give you great flexiblility on sources and tailoring teh sound (may even adjust for room modes (notch filtering))
A great amplifier will get you better sound - generally more headroom and better transients - provided you have speakers that will make use of the extra amp performance! (Don't spend 10K on an amp and preamp and only $500 on speakers. Imagine a racing car with no gearbox and tires!)
A great amplifier will get you better sound - generally more headroom and better transients - provided you have speakers that will make use of the extra amp performance! (Don't spend 10K on an amp and preamp and only $500 on speakers. Imagine a racing car with no gearbox and tires!)