Anything should be equally easy to wire in – as mentioned above, it’s just 2 control wires to the boiler.
I have Drayton at home – it’s good but for a flat, if you don’t want zoned heating (i.e. smart TRVs) I would definitely consider a Nest. They’re pretty basic these days as smart thermostats go, but we’ve had one at work for years now and it’s never, ever gone wrong. Plus the thermostat is mains powered (via USB) so one less thing to worry about whereas the Drayton stat requires batteries.
Our Drayton also occasionally seems to lose connection for a few hours although I’ve gotten round this by putting it on a smart plug which reboots it if it becomes unresponsive. They were supposed to be addressing this via a long-awaited firmware update but I’m not sure if this has actually happened yet!