The Triple definitely loud. However, 50 watts more in the real world is not a very big difference from the Dual. I think it equates out to something like 3db.
As Elpelotero said, tubes will cost more. I think that's the trade-off: tighter and more clear sound at the cost of buying tubes.
What I disagree with is the need to play louder to get a good tone. My Triple sounds amazing at low volumes paired with my Recto 4x12. Granted it sounds better louder, but I'm happy playing even at volumes where the strings of the guitar make as much noise as the amp. I guess my point is, pair it with a good cab, either the Dual or the Triple, and you'll never be disappointed.