Tips on selecting the right GRC tools

While the documentation of the basic GRC tool will be useful in the implementation phase, the documentation of the configured application will be how auditors, new users and light users will understand how to get what they need from it.
While technical capabilities should be foremost in your mind, also look to see if there is a large, engaged and invested user community, and make that part of your decision process.
Someone in your organisation will need training in the intricacies of your chosen platform, and the sooner the better. Negotiate the training costs before signing the contract, and attend the training before or during the implementation.