It depends on. Two months ago I ditched my iPhone X for a brand new Note10+ in a test basis and... Didn't come back.
But, it's necessary to make some clarifications. I have all Apple ecosystem (iPhone X, iPad Pro 1st gen, Apple Watch 4, MacBook 2015, AirPods, Magic Mouse, only not Apple TV) and, though all works flawlessly together, I could manage to replace them with my Note10+ in a way I didn't think I would.
iPhone was ditched as smartphone, as start point.
Then, I began to use DEX at work and at home (my computer use was always mainly for Office, email, internet and so on, very light even at work), which made me abandon the MacBook.
Then, I realized the Note screen is pretty good for light content consumption, so my iPad use dropped considerably (still uses it, though, only not as much as I used to).
I bought a Chromecast, and my Note turned to be my main TV (no cable subscriptions, here, only YT, series and sports, all online). I didn't have this use with my iPhone, as I always thought of Apple TV as an overpriced device.
AirPods works flawlessly with it. Magic mouse do it perfectly with DEX. Apple Watch is, still, the best smartwatch out there by far, so I keep it synchronized with my old iPhone, which I maintain on my desk at home, and connect it to my Note via 4G and Personal Router feature. Works seamlessly.
I really miss iMessage. No substitute here, as my wife still holds her beloved iPhone SE.
But, by making the exchange, I gained extra battery life, better camera and the unique S Pen, which I use several times during all the day since I'm Professor and researcher, so to be able to make notes everywhere and every time is mandatory to me (actually I used to carry with me a little-portable-analogical-notebook and a BIC pen to do this... always).
So, that's all a matter of needs and targets. For me, the change was a big success, even in ecosystem terms. But that's me, and only me.