I don't think the Lumia 950 deserves to be on the same list as the BB Playbook.

By the time the Lumia was released, Windows Phone was actually quite useable and snappy. It's the completely empty app ecosystem and the years of head start iOS and Android had that killed it (apps were not portable from the earlier incarnations of WinPhone).

The playbook was just a joke. No emails, no calendar, no apps. Software was incredibly buggy and it felt years behind the iPad. Actually, no, to get the calendar you had to pair it with a blackberry phone if I recall.