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Back from testing. It seems that by the time you can complete a gunblade (unless your opponent is feeding you a lot) the laning phase will be close to over. So lane sustain is not a factor in this decision given that both HG and BotRK build from a cutlass (which should be built first on either), so they both offer the same lane sustain. However BotRK has a much better Active and serves to help with the health stacking I mentioned before.