Depends on the circuit, I have Rogue m180s, with Revel f208s and have tried kt77s, kt88s, kt90s, and kt120s, in my system the kt77s sounded tonaly the best, while the more powerful tubes sounded "bigger"
I'm fortunate, my amp will take most common output tubes. It came stock with EL34, the EH EL34 are a great tube for the money....
I have also used Gold Lion KT66 which are pricey but great, I think my favorite tube and currently in use is the Gold Lion KT88....again, pricey but excellent sound.
Be careful of the heater currents the KT120, are up to 500mA each more than a KT88 times this by 8, and you can cook the heater supply, and it probably sagged below 6.3v because of it. My bridge rectifiers crack in two on my Rogue's when I owned them.
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