All cats can get to over 75% crit chance with Bite alone, and a +1,2 crit multiplier is well worth 2 mod slots on a companion. Adarza just also has Cat’s Eye, so you get to often double dip on the buffed crit damage with orange/red crits. Whether that’s better than something like a Panzer is up to your frame/weapons, but it’s a worthy contender now.
It’s actually around 40% uptime with Tek Enchance. It’s pretty useless during high mobility missions when your kavat spends most of it’s time trying to catch up to you, but during more stationary ones it’s pretty good. It’s also affects teammates, so that’s a little extra added utility.