I would always prefer the full-featured trial version with atleast a month evaluation time for big feature rich products.

I would also go for the full-featured but the one which displays a message that it is a trial version, even in the deployment, so that i can convince my client to evaluate it and go for it.

The other option of limited feature is actually a loss for the product company, since anybody will continue to use it if they find the feature they want in the free but limited version. If there is a feature that i need but not included in the trial, then it will be very hard for me to choose the product, since i am not able to use and test that feature.:-)

Edward.