Call me old fashioned cos even after I'd gladly signed up for Alipay (mainly to buy things from Taobao/Tmall) I've still declined to sign up for Wechat Wallet.
Main reason being that I see Wechat as a chatting/social media tool (very good one at that) and that it may not be secure to also put my bank acct details in that same app.
With Alipay it seems a more secure thing, partly cos it was so damn hard to sign up for as a foreigner!