I like a semi-gloss for floors in good condition. My partner likes shiny floors and I don't...it's a personal preference. In general, glossy finishes tend to highlight surface defects Surprisingly enough, one place to use a high gloss floor finish is for an old house floor in really poor condition. Then, the gloss is more noticeable than the floor itself and the shiny new finish improves the look.

Who can help me weigh the pros & cons of matte versus satin finishes for a dark maple floor?

Not at all! An oil finish look is definitely in style and also leaves a natural enough look to be timeless. If it is an oil finish real wood product, make sure to ask about the maintenance involved. Sometimes consumers are unaware and once it's installed they have issues.

Loaded question. Demographics will determine "popular" (what is "in" in Savannah Georgia is "out" in upscale LA California). What you will find easy to live with is personal. Those who LOVE "shiny clean" will HATE matte. Those who love "natural" hate glossy. Clear as mud, right? Go with what you like...and what your personality believes is a nice finish. No one can choose a floor for you. If in doubt...go mid-tone brown with undertones that you like.