Standalone Outlook is still the most powerful if you ask me. Thunderbird is great freeware but if your looking for some serious email management I would go with Outlook.
Have been using Outlook deeply for years, moved to Thunderbird 2 years ago. Not sure which features you point out, but i think TB goes far away on all its functionalities. Is a great product, freeware or not.
You would love Thunderbird as I do . Outlook is classic, but Thunderbird is fresh
I changed from Thunderbird to TrulyMail a couple of years ago and really like that TrulyMail bundles in all the functionality I used to need to use add-ins for. I’m very happy.
I think it’s safe to say any mail product from AOL is going to suck.
About 15 years with Outlook and still love it
Best regards Andrey