There was no poll when I posted. Now that there is, I'll choose 93-99. Not just because it was the most productive era, but it was also a time of creativity. The most original adventures were developed in the nineties. Dark Eye, TLE, Bad Mojo, Bad Day on the Midway, etcetera.
EDIT: I forgot my beloved FMV, it's the FMV era.
Thanks to the introduction of the CD.