Adobe Sign Trial Account vs Developer account

Hi,

I am currently using an adobe sign trial account :

https://walmart-demo.echosign.com/public/login

I want to know the features that are present in developer account and not in trial account. Basically the differences between both. I want to add some more features that are not available in trial account(eg. removing the adobe sign stamp watermark,etc.) and need to know whether the developer account supports them.

Thanks.