Bad Metric?

I was asked why I presented teams above .500 and then compared winning percentages at home.
It could be a biased metric since we already know they have a winning record. An interesting comment which boils down to, compare the teams with winning percentages at home to winning percentages on the season.

Teams that have more wins than losses at home are 57 - 17 at home (77%) 38-32 on the road (54%) and 95-49 overall (66%)

Teams that have as many or fewer wins than losses at home are 21-49 at home (30%) 28-46 on the road (38%) and 49-95 overall (34%)