Grimaldi

I am considering a Zehnder Q450 and was wondering whether to go for normal vs enthalpy exchanger. I am located in the Highlands of Scotland. My limited research shows that the decision is a trade-off between efficiency vs maintaining more optimal humidity in colder / dryer climates. Ideally I would go down the normal route given higher efficiency but wondering if anyone has issues with too low a level of interior humidity in colder parts of the UK. I can imagine real issues in places like Scandinavia where absolute humidity at temps of -20 may be super low, but wondering if a more typical Scottish winter temp of 0-5 degrees merits an enthalpy exchanger? Thanks