WHMpress offers the highest level of flexibility. It allows you to customize shortcode defaults from WHMpress > setting shortcode defaults and then allows you to override these defaults while inserting a shortcode.
Pricing table is a composite shortcode, it includes product name, description, price, price combo, and order button shortcode. The pricing table (and all composite shortcodes) will use default values for the shortcodes used within it. You are able to customize the Pricing table itself through default values or through the menu while inserting the short dose. But to customize the order button or pricing etc, you will need to change the default values of the pricing and order button.