Google Checkout vs. PayPal vs. Square

Google Checkout vs. PayPal vs. Square. Which to chose? I was looking to implement some simple on-line and on-site sales transactions and chose the iPhone Square for simplicity and cost. Below you will find how each service compares on multiple sales metrics and how it breaks down per $100.

Google Checkout https://checkout.google.com

Monthly Sales Fees Per Transaction Fee on $100
Less than $3,000 2.9% + $0.30 $3.20
$3,000 – $9,999.99 2.5% + $0.30 $2.80
$10,000 – $99,999.99 2.2% + $0.30 $2.50
$100,000 or more 1.9% + $0.30 $2.20
PayPal https://www.paypal.com
Monthly Sales Fees Per Transaction Fee on $100
$0 to $3,000 2.9% + $0.30 $3.20
$3,000+ to $10,000 2.5% + $0.30 $2.80
$10,000+ 2.2% + $0.30 $2.50
Square https://squareup.com
Monthly Sales Fees Per Transaction Fee on $100
Card Swipe 2.75% $2.75
Manually Enter Number 3.5% + $0.15 $3.65