I mean it’s cool obviously different opinions happen. But imo tbc had THE best tier sets for gear (with t6 being number one). And all raids were amazing in terms of fun mechanics (hyjal could be argued), and it was the last version of wow that had progressive raiding in terms of tier progression.
Wotlk was great and I loved it and I would spend my most time on that personally but tbc was probably the best version in my opinion, I would just not have enough time to get past t4 content.