never played D1 so cant answer there. love titan. but its close between titan and EDZ. the order i do dailies is : mercury - get it over and done and move on nessus - used to dislike it but since osiris dlc i find i like it a lot more. its grown on me. love both of failsafe io - this one opposite has happened. like the adventures. liked more than nessus now its other way around and seems emptier than other worlds. titan - small, but somehow i really enjoy it, usually i have an excuse to visit the arcology also. EDZ - huge, lots of regions, lots of sectors.