which rom stock or custom

i have just received a mate 8 L09C636 and have just unlocked the boot loader. Which rom would be best. I plan to root and use adaway.The stock one which is b170 or should i go upto B321 or should i go with twisted or kangslim. How much space does twisted or kangslim take up. Im not a fan of bloat. Also battery performance what is best

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