Quebec City lower town vs. upper town?
 

Does the lower town or upper town offer the best selection of restaurants, bars, cafes and shops? How do the 2 areas compare compare in other respects, eg. street activity, attractions, sites, safety, etc?

i think yes

Really not much of an issue no matter what you choose. The old city is fairly small, so you can easily walk from one part to the other. I prefer the upper area because of it's spectacular views. The lower section may have more small shops and restaurants, but both areas have plenty.