My verdict: the pragmatic and accessible choice.
Todoist isn't the most beautiful, but it's the most reliable and accessible. Perfect cross-platform, collaboration included, generous free tier. For teams or those who juggle between devices, it's the reference. The interface is clear and synchronization is impeccable, even if the design can seem dated.
What I like less: less refined design than Things 3, some features require Pro, the interface can seem dated, gamification (karma) not for everyone.
My advice: start free, go Pro if you use advanced labels and filters. It's the best value for money on the market.