Given the nature of Horde, generally, I don’t have one. Some classes I only use the ult when necessary(eg Pilot, or never before a boss wave if I know I won’t always get it back quickly unless I need to perform a save), and depending on enemies spawned in I may not hang around the base. If what’s left is a Bolter, Snipers and a Guardian, and I’m last one standing, it may not be stupid to try getting the Guardian away and take out some other enemies before you revive anyone else.
Also make sure you drop some of the useless starting weapons for something more useful. Having an Enforcer as Pilot without Enforcer Expert(and let’s be honest, who uses that as a Pilot besides like one or two players in the entire game) is one of the worst possible things in a last man standing situation. Even a Claw is better.