grass fed or grass finished? Because if they graze for a bit, but then still have to fed a ton of feed crops to fatten them up fast enough, it's a distinction without a difference.

In the end, all versions of beef production remotely possible are either insanely inefficient in yield or in resource usage or objectively cruel (aka factory farms). A vegan diet is absolutely going to be the better choice on every reasonable metric for the vast majority of people and life situations (aka Inuits don't count).