Long Live the Confederation!
Experience is sure to be an issue as well - Eisen states repeatedly that the Victory is falling apart and has been giving poor assignments as a result. The Tarawa meanwhile, has a battle-tested crew that had to fight through hell and high water just to get back into Human Controlled space.
By 2669, though, Victory was getting incredibly experienced personnel - part of Tolwyn's plan for supporting the Behemoth. The fighter wing assigned to the Victory in late 2668 (36th FW) was run by highly experienced veterans... Maniac Marshall, Ralgha nar Hhallas, etc.
(... and, of course, it might be worth noting that Tarawa ends the war crippled while Victory goes deep into Kilrathi space multiple times and makes it out scratch free multiple times in the same period...)