For the Nova Cats it would have been better choice if they had not betrayed the Clans. Since then they had been on a steady down spiral.
The Clans betrayed us. All they ever talked about was "bring back the glory of the Star League," but when the Successor States reformed the Star League in the face of an impossible threat, it was deemed not good enough, not a 'real' Star League. Only we had the understanding and vision that the Crusader Clans had become the new Amaris, and that an imperfect and attainable solution is better than no solution at all. Our real mistake was trusting the Draconis Combine to see us as a sovereign people within their empire, rather than a skilled military force that threatens their power structure.
But had we stayed with the other Clans, would we have done much better? Smoke Jaguar, Fire Mandrill, Ice Hellion, and Steel Viper have all been annihilated. Hell's Horses are doing well, but they prove my point regarding the Nova Cat defection to the Star League: Alaric Ward's ilClan Star League is not
their vision of what the Star League should be, so they refuse to acknowledge it. Diamond Shark is doing well, though to call them a Clan at this point requires an asterisk. Our longtime rivals for 'best marksmen' the Goliath Scorpions, and our sometime allies the Snow Ravens have middling holdings in the Periphery. Ghost Bear is fully integrated into the Rasalhague Dominion--their loathing of us notwithstanding, their path is what we hoped for. Wolf is spread dangerously thin, with a nigh-impossible mandate, and Jade Falcon? Better to die out than have their record of war crimes and current position as praetorian guard for their 'betters.'
No, our mistake was simply believing that a culture that regards honor in battle highly would automatically be amenable to us. Clan Nova Cat lived and died making the right choice, no matter what anyone else has to say about it.