Evohome, DHW priority and x-plan

I'm looking at replacing my boiler, probably with Intergas. I already have EvoHome complete with DHW control.

The question I have is around DHW priority. There are a number of articles that suggest that x-plan is the way to go, so you can have hotter water heating the cylinder than heats the rads.

However, Evohome has a DHW priority function, and I was wondering how that works, especially when utilised in conjunction with OpenTherm? Does anyone have any knowledge or experience of this?

PS Any recommendations for Intergas installers in the Bedford area appreciated.

Thanks