I have a description of the DragonQuest rules elsewhere. I'm glad I started this out in DragonQuest (DQ); I liked the DQ rules much more than AD&D, as they allowed much more flexible and detailed characters and more interesting tactics, as well as allowing every character to have some magic. It gave a much different feel to the campaign. I had previously used DQ to play a moderate length campaign using the wonderful DQ adventure The Enchanted Wood, written by Paul Jaquays and published by SPI, and had been very pleased with how DQ played, and it was a good fit for the campaign.
Eventually, however, I became dissatisfied with DQ, probably due to the number of independent forumulas that I had to calculate when updating major NPCs and the players had to calculate when updating PCs.