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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I know PRS are very good guitars from what ive heard. I've never played one though. They look nice too but i do have a feeling that must of them are quite expensive. Out of what you have said i would go for the PRS.