Our PayPal here account works a little differently than above. When a card is swiped the money goes to our business PayPal account. We can transfer that money to our bank account, spend it directly using the PayPal account with PayPal checkout online or an added a debit card. We declined the debit card and just move the money to our bank account. You may be able to have it go automatically, I'm not sure but definitely with a click when your logged in. Also does a lot of customer management for credit and cash purchases and generates tax reports and such.
I have not used Square but I have heard that the money may well get to your bank a day or so faster with Square but with PayPal there is a way to have instant access to some or all of that money. So as usual there are pros and cons top both services.
Another reason we chose PayPal is that you can actually talk to a person if you need to and I hear it is hard to get that level of service with Square.
I see a lot of postings around where folks like to setup both of these services and then run cards based on their particular circumstances and to have a backup if there is a problem.