I prefer my Square reader at shows and would use Square on Etsy if I could.
The simple decision is that it takes 2-3 days to transfer funds from Paypal to my bank accout. Square goes in immediately. If you have a weekend show, it goes in on Monday. If you have a weekday show, the money transfers for use the next day.
Also, though Paypal offers the debit card, they will not give it to everyone. Square has no credit check. Its just a tool, after all. Plus, if you don't have a Square and need it immediately, you can walk into a number of places, including Starbucks, and buy one for $10. When you register it online the $10 goes back into your bank account, so its