Watts vs input sensitivity __2 Different size Amps

And Jtinn, too, strikes out! :-)

The 200Watt amp has 3dB more power than the 100Watt amp. 1.3V. is 2.72dB higher than 0.95V., VERY close to 3dB different. Therefore, the 200Watt amp will produce almost exactly 100 Watts with an input of 0.95V.

Of course, as Jtinn already indicated, the 200Watt amp will indeed deliver 200 Watts into 8 Ohms with an input of 1.3V., whereas the 100Watt amp will merely clip badly with an input Voltage of 1.3.

So you'll get the same gain and subjective loudness* with the 2 amps, but the 200W. amp will have more headroom...3dB more.

* unless both are driven VERY hard
.

Sogood51: "I'm sure you know that the lesser power amp is the limiting factor.

That's true only if one generally drives the 100Watt amp so hard it clips OFTEN. If the 2 amps are driven so that the lower-power amp clips only occassionaly, the lower-power amp will NOT be a limiting factor.
.

Jasljis: "...need a little more power without having the attenuator pot all the way turned up."

The higher-power amp will NOT help if that's your 'problem', and, frankly, I don't perceive it as a problem, but it's not my system. :-)

If you want more level (volume) with the pot at a lower setting, you need a higher-GAIN amp, not a higher-POWER amp. Don't waste your money on a 201.
.