personally, i'd say "were much fresher"

That section doesn't sound so bad to me. I might change it to ...than the ones AT the other stands.

They are okay, but I think they have room for improvement. Here's how I would make them sound more natural ( [] - more formal alternative, () - optional). 1. There are lots of [many] places in the city where you can buy it. 2. a) MMJ is the closest place in the city. b) It used to be my favourite place for years, but (it is) not anymore. 3. Their sandwiches were the most generous of all. The vegetables were way more fresh [much fresher] than at the other stands. It is not a good practice to list two independent sentences with a comma between them as you did with 2b) and 3). English is not very permissive of such constructs. I suggest you either connect them with a conjunctive or make them two separate sentences.