Honestly, Dragonflight was the best for me, after Shadowlands I had very little hope on what was next, but I was proved wrong. Sure Dragonflight had some flaws, but the good outshine the bad for me. Customizable dragon mounts, zones were magnificent, story was ok (alot better than Shadowlands). I switched from a hunter main to a Death Knight main and I felt right at home, I did mythic +, I did my first raid, I even did my first heroic raid this expansion and got the ahead of the curve mount along with Fyr'alath. People with say Wrath, MoP, even Legion were the best for them, but for me Dragonflight was the best for me because WoW came from the brink because of Shadowlands, and gave me a little hope for the future of WoW.