Never used ovis. Core4 merino shrunk bad and I don't care for the 50/50 stuff because it sweats bad and stinks (for me).
Had few years ago version of FL wool shirt and it lasted half a season with holes everywhere, I have heard there new stuff is better but I have not tried it. I started using kuiu wool and stick with that. No issues with stink or shrinkage or holes with kuiu on the pieces I own. For boxers I prefer smartwool over FL because I have two FL boxer that have worn out (likes rips and sewing coming undone in the crotch) after 2 years of use.
Had few years ago version of FL wool shirt and it lasted half a season with holes everywhere, I have heard there new stuff is better but I have not tried it. I started using kuiu wool and stick with that. No issues with stink or shrinkage or holes with kuiu on the pieces I own. For boxers I prefer smartwool over FL because I have two FL boxer that have worn out (likes rips and sewing coming undone in the crotch) after 2 years of use.