First, the Slipstream Saber's Attack Damage +5% weapon upgrade is an excellent boost to Cloud's overall damage output. Combine this with Unrelenting Punisher and Formidable Counter upgrades to increase the amount of slashes you can do in Punisher mode and Punisher's counter damage by 15-percent, respectively.
Other blades will help you double down on either magic or physical damage, but Slipstream is exceedingly efficient at splitting the difference.
It may be a goofy-lookin' thing, but the Igneous Saber should not be underestimated. With a strong emphasis on physical damage, this sword is all about smacking stuff good. If you prefer sticking with what works well, that's probably the best you could swing for regular combat.
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