I think a lot depends on the terrain and how fast we want to go.
I have not posted in this forum for quite some time but used to be a regular poster. Started riding tandems in 1980 with my wife. We have toured, trained on and raced the tandem on flat and hilly courses. And we each have power and other metrics when riding.
The last time we road the tandem was 2018 in Tahiti and we did a 55Km mass start road race. Then we toured the islands. Lately, we have been racing team time trials and this year won the SoCal State championship open team time trial for two person mixed trial riding individual TT bikes. I suffered immensely in that race. If you asked me after that race, I would say the tandem was a cakewalk.