I'm just now getting to all the tax info (I know a little late, but I'm still on time!), and so I'm doing comparisons and found this thread.
When you have a transaction through paypal, though, Etsy still takes the 3.5% sales fee from the item price. Not the transaction amt., but the sale price (not including shipping). So, this might make DC the preferable way to go.
The rates actually come out to be:
PayPal
0.30 + 2.9% PayPal transaction fee (including shipping price) + 3.5% Etsy transaction fee (not including shipping price)
Etsy
0.25 + 3.0% Etsy transaction fee (including shipping price)
Just wanted to put that out there. =0)