Our use case for Conga Sign is pretty straightforward. Because of this, there is not much about it that would be considered excessive or inappropriate. It suits our needs as a tool to record data provided by a signer. It can also be launched from inside Salesforce via a custom button for ease of use.
I really love Sertifi. i have used other platforms in the past and Sertifi outdoes them all. I feel the contract aspect of the system is seamless and really makes it easy to send out agreements, revise them if needed and know when the customer signs
We're a relatively high-skilled team and we all find Conga Sign's user-friendliness very low for all user types. It should not take a highly skilled tech person to complete documents. Documents need to be user friendly for all user types.
Conga Sign is much more affordable than DocuSign for our organization and we are using Conga Composer already to create documents. We found that the integration between Conga Composer and Conga Sign was easier to use and we have a nice discount from Conga due to us adopting several of their products. DocuSign for the price point didn't make sense to us and it has less write-back functionality with Salesforce.
Sertifi is nicer to the budget with close to the same offerings as Adobe/DocuSign. Adobesign and DocuSign are a little easier in the configurations with Salesforce (if you don't have a Salesforce developer, you would probably lean toward something other than Sertifi), but if you aren't needing too much customization other than out-of-the-box functionality, Sertifi is perfect.