I just switched from my final BlackBerry after 10 years in the B.B. ecosystem to an iPhone X. The Android app compatibility extended the life of my Classic for an extra year but was hamstrung by being painfully slow. I could run Spotify or Google Maps but only just so, and forget about multitasking.
I still miss the BB10 workflow. Messaging, multitasking, swiping was all perfected ahead of the mediocre implementation of those in iOS 11, but the X is so fast, I can just brute force my way around the UI gaps and get shit done more quickly.
Nothing will ever replace the Hub, though.