Though their marketing naturally swings for the fences, I've always been impressed with Asana and it's basic simplicity (but also many [optional] integrations).

Though their marketing naturally swings for the fences, I've always been impressed with Asana and it's basic simplicity (but also many [optional] integrations). They even have a Trello comparison page: https://asana.com/compare/asana-vs-trello https://asana.com/compare/asana-vs-trello