Both systems aren’t worth the money you pay for unless there are games to play. Unfortunately for Sony, their heavy hitters won’t drop until late this year or early 2008.
Once Gran Turismo 5, Metal Gear Solid X, Ninja Gaiden II (yeah, you heard right, they are making one for PS3), etc drop, then you will see sales pickup. Right now game selection for the PS3 is iffy at best.
Xbox has a few good titles out, so it’s easier for them to sell.
Now that I just built a PC, I highly doubt I will get either console unless some game just completely blows me away.