Both amplifiers will more than serve your requirements adequately.
Experience has shown me that WPC to not always serve as the ideal measure of power. Not to dismiss the spec out of hand, but it is an algebraic (steady state) measure, while we live in a world of calculus (dynamic).
Instead, I'll put forth the contrarian assertion that the ubiquitous transformer coupled push-pull tube amplifier with two tubes per channel will drive a loudspeaker far more similarly than differently in terms of seat of the pants power whether using 2A3 (10 - 15 wpc), 300B (20 - 25 wpc), or EL34/6550/KT88 (30 - 75 wpc). Doubling the number of output tubes to four shows the correlation still holds up. In other words, we will often draw surprising conclusions in regard to amplifier power if we move away from drinking by the label.
Experience has shown me that WPC to not always serve as the ideal measure of power. Not to dismiss the spec out of hand, but it is an algebraic (steady state) measure, while we live in a world of calculus (dynamic).
Instead, I'll put forth the contrarian assertion that the ubiquitous transformer coupled push-pull tube amplifier with two tubes per channel will drive a loudspeaker far more similarly than differently in terms of seat of the pants power whether using 2A3 (10 - 15 wpc), 300B (20 - 25 wpc), or EL34/6550/KT88 (30 - 75 wpc). Doubling the number of output tubes to four shows the correlation still holds up. In other words, we will often draw surprising conclusions in regard to amplifier power if we move away from drinking by the label.