The thing I like about Django is that it is an opinionated framework so lots of decisions were already made for me. Flask is a not too distant second place.

With aiohttp you can make neat things it is operating a level below Sanic - in my experience people end up writing their own half-baked undocumented framework based on a combination of aiohttp, some ORM and a template engine - sometimes with half a dozen combinations in the same company.