What is the difference between PayPal Standard and PayPal?

I am not sure which one I should be using.  Can you explain the differences? Also, if i have multiple items is there a way for the quantity of each item to be reported in a separate column in the submission list? 

PayPal is using PayPal checkout and it doesn't require users to navigate away from your website unlike PayPal standard.

You may review them from the links below:

PayPal Standard: https://www.jotform.com/help/391-How-to-Integrate-Form-with-Paypal-Standard- 

PayPal Checkout: https://www.jotform.com/help/542-How-to-Integrate-Form-to-PayPal-Checkout

Let us know if you have any questions or if you need further assistance.