DS3 is more polished and complete compared to DeS but it holds a special place in my heart. The atmosphere of this game is probably the best in From's catalogue.
4
Dark Souls III
5
Dark Souls II
While the original DS2 had it's issues, I absolutely despise the attempt to fix it in Sotfs. They added a bunch of enemies in spots where it was absolutely unnecessary resulting in some of the most ganky areas ever.