| 2 very different amps. You'll never really know until you try em out.
4 Pro - kindof an industry standard, won't sound bad but might not be exactlw what you're looking for. A lot of clean headroom, very versatile tone control.
6 Pro - double powered 3 pro. IMO can get more drive and "tubey" than the 4.
I tried the 3 and the 4 and like the 3 better but ultimately neither held a candle to an all tube amp and ended up with a 2 pro. If you're going for a tube sound, you'll be disapointed with a hybrid. If you're looking for a solid tone with versatility, go 4 pro. If you just want a hybrid rock tone, go 6 pro.
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svt ampeg svt 4 or 6 
