I have tried both and they are quite different
Bobbi's feels a little oily going on (its actually oil-free, but it does contain beeswax), but blends really nicely. You can get a light coverage or a good full coverage depending on how much you apply
MAC's is definitely drier (not sure if its oil-free?), so its a little harder to blend/sheer out, more of a medium to full coverage.
Deciding which one will be better for you depends on what level of coverage you're after and what skin type you have