really not that big of a difference. if you want to do alot of tramp stuff tahoe is marginally better, but next year central park will be lappable at copper, so that makes it basically the same as tahoe on-snow wise. Really, whichever plane ticket is cheaper or whichever is a closer drive would be the best option.
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Ok, first off Boreal is absolute shit. If you're putting copper against boreal, copper all day. However Truckee is only about 20-30 minutes from Squaw, Alpine Meadows, and Northstar. Sooooo, that throws a whole new element to your question.
If you're smart, if you value your continued existence, if you have any plans about seeing tomorrow, there is one thing you never, ever put in a trap.