That depends on what you want to do more of. If you want to make castles and dungeons and stuff like that I would recommend Dunjinni but that is just my personal preference. CC3 is little harder to learn but those who use it love it. Both are actually quite easy to learn but hard to master. I would suggest looking through the user forums on each site to see what the general membership submits and see which you like better. There are many CC3 maps here and few DJ maps but the DJ forums have some really great artwork that you can use on maps.