As much as I love Halo this fictional battle has been done to death. Star Wars has just too much power going for it, a medium turbo laser on a destroyer generates 200 gigatons of energy. And there are multiple turbo lasers on a light destroyer. A heavy turbolaser puts out 175 Teratons, releasing 175 x 4.184 x 10^21 J, or 7.322 x 10^23 J of energy. Per second. These are standard weapons. Star Wars wins just through ludicrous overpowered numbers. On the other hand, does it matter?