What is the minimum aperture you think that would reveal satisfying features on Moon? (Remember there's no aperture large enough which can reveal more than the naked eye aperture of 'em Apollo astronauts. The operative keyword is minimum & satisfying view of the lunar features (eg. craters, rilles, mountains, valley, domes, cracks, etc.). In other words, the poll is not asking what is the optimum or favorite aperture you use . This is an opinion poll.
For in-between aperture, please choose the lower number (eg. choose 3-inch for 90mm).