I wouldn't bring it up when talking to them.
Probably directional. It is likely defaulting to include multi-directional since that can always work. But, as Darryl said above, you can get more crosstalk and multi-path issues, which can reduce signal quality.
If you want to be more technical, look at the direction given for each station (that you care about). It shows a degree like 45deg or 264deg. They are probably all very similar.
Ex:
Mine show 92-95deg for all our Minneapolis stations (basically all the same direction), and then I have some from a smaller town an hour away at 153deg (nearly opposite direction). Since it recommends directional for you, I'm assuming your main stations are within a small range, like mine. I don't care about the smaller town stations, so I ignore them and use a small directional.
So, if they are grouped together, directional should be the best choice.