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IMO the best features are those that are the most relevant to you. That's what makes our discussions interesting. One person might have their top 3 favorite features that are practical/advantageous to their use cases, while someone else may have a different list of features that are best for their circumstances.
Personally, I love Butler automation. That's a pretty popular feature high up on people's list (amongst other things of course). I'm sure you'll find others sharing their learnings and insight with you here.
Here are some relevant resources/articles/discussions from other community members you can check out if you haven't already:
