If you are looking purely at battlegrounds then awaken shocker but if you want more allround content or non-bg focus then Shang Chi.
This is not to say that Shang Chi is bad at BG, it just means that Shocker's biggest value is defined in BG
That's underselling Shocker.. he's fully capable of necropolis fights.. SP3.. then 2 sp1s to get over 100 charges. Then each sp1 stuns.. light whiff to get closer and Heavy hold during the stun will hit 100k each. then wait for stun timer to come back and use sp1s to stun and repeat this loop.
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This is not to say that Shang Chi is bad at BG, it just means that Shocker's biggest value is defined in BG