My preferred choice of innate damage is Heat or Magnetic. Honestly just depends what you want to use this on more Grineer or Corpus. You can pretty much [Reach] 5x crit buildup if you have all of the gladiator mods on as well FYI.. ;) (I tend to swap [Spoiled Strike] with [Shattering Impact] from time to time for shredding Grineer armor with impact)