fitbit zip and hrm

bebegettingtheweightoff

question?

Hi,

I use my fitbit zip all day then use my polar fitness when working out. So when I log my hrm calories after my workout, I do have my fitbit linked, at night when I sync it my exercise calories get higher. So my question is should I be using one or the other ? or does it adjust all day from the fitbit zip? Please help

Thanks B