Google Places Competitor Category Ranks (Should we copy them?)

[GrouchyKids]

Competitors use "Interior designer" as primary category in Google My Business, they rank well in Google Places, across the phrases we target.

Currently we use the same category, but "Office refurbishment service" would seem to be more relevant to us.

Should we move to "Office refurbishment service" as the Primary category in Google My Business?

If we do move would we need to change our citations?

And for other keywords should we be influenced and copy the categories used by our competitors?