I've used several Android devices over the years with the S8+ being the last. Using the X now, and have had every gen iPhone except SE and 5C. I like the integration iOS provides with all my other Apple products, plus I love my Apple Watch.
With that being said I've been toying around with either adding a second line or going with another provider to get an Android phone as well. Switching sims is still a bit of a hassle sometimes with iMessage and FaceTime.
I do enjoy both OSes, it's just hard to justify the price b/c all the Android phones I'm interested in are pricey, plus the additional plan.