i-Edge Or BT first on jinx

I main jinx adc, well, that's one of my most played favorite role to go. But, I never knew what to start on jinx, her first fully built item, I always started infinity edge but lots also say to start bloodthirster, please confirm what's the best to get first?!?!?{{champion:222}} {{item:3072}} vs. {{item:3031}} ?!?!?!?
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