By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.
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Well it depends on how long you have been playing, how good you are and what type of music you play! Maybe if you tell us we can help more. I'm sure there are some smaller amps that give good sound but generally a half stack or full stack will give you a great sound. Also it depends on how loud an amp you need !