What are your fundemental goals for your new smart home platform? Ease of use? Simplicity? Mobile App?? If for example, those traits are of fundemental importance, SmartThings is worth a serious look. But not much else can be said in terms of advantages over Hubitat. SmartThings techincal support, for example, has become so overwhelmed that it takes weeks to get a resolution to a problem, if you are lucky to get one.
There's nothing wrong with diversification, especially when you can use a central hub to tie them all together. The upside is that an outage is not likely to affect more than one provider at a time.Yet, if the hub should fail, you still can fall back to each companies native app/website.
