The Path of Mettle version of Boros will likely have a better matchup against control due to Path of Mettle and Heroic Reinforcements being difficult to deal with, but I could see wanting the one-drops instead. Legion's Landing is particularly good against them. This version has some additional staying power, but I worry about its matchup against decks that are trying to get under it.

Against other aggressive decks, it probably comes down to how important Path of Mettle's enters-the-battlefield effect is against them. Otherwise, with the lack of one-mana interaction, we're probably going to have to rely on our sideboard to carry us.

Integrity is great and I won't repeat myself too much, but it helps mitigate the drawback of Relentless Raptor.