Just for the fun (and rigor) of it, lets say the answer to the question "What's more important the mic or the preamp" must not be answered through the use of analogy, parable or anecdote and has to be answered using electrical engineering, acoustical and / or musical terms.
I'd really like to read some convincing arguments supporting one proposition or the other - but arguments grounded in and expressed through the language of the recording arts - be it electronic, acoustical or musical. Think of yourself applying to work at Abbey Road in 1959 and the question (or similar) was asked of you. Yeah I know the preamps used by the BBC were pretty much what were in the consoles. The point I'm trying to make is the BBC and perhaps Bill Putnam on the West Coast epitomized the highest standards of audio engineering excellence. These people could communicate audio engineering problems and solutions without resorting to analogy.
They could speak directly in the language of audio engineering - electronics, acoustics and musicology. With this in mind, what is more important - the microphone or the preamplifier?