I'm planning to buy one of these 2, can I have some opinions please? -Wich amp has the highest output volume? I heard that some amps like the Ampeg SVT3pro have a low volume, I have to feed power to an Ampeg SVT410HLF cab so this I something I don't need. -Wich amp of these 2 has the most tube-like sound? -What is the main difference between these 2 amps?