favourite is gen 4! there's a hefty amount of bias because it's the generation i've played the most of, but i still think it's got a lot going for it. fun level design, deep worldbuilding and can be challenging if unprepared
for least favourite, it's gen 8. i think it would've been really good if it had more development time, but it's a missed opportunity as it stands. the DLC did address some issues though, to its credit