Ditto Reno - take the Wye if you happen to have a choice, but in my experience, the poco is going to tell you what you'll be getting, and you design accordingly.
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(Qty. 2) 1Ø transformers wired into an Open Delta will give 20A @ 120V or 10A @ 240V 3Ø
Small point of clarification here - open deltas are pretty much the same as a closed delta except they need to be derated to 67% of nameplate value because of the missing transformer.
Radar
There are 10 types of people. Those who know binary, and those who don't.
