Pretty sure the weakest is 4th Gen and the Strongest is 3rd
4th Gen started in 2018, at that time BTS and BlackPink were the biggest Groups in the World
5th Gen started in 2023, BTS and BlackPink were STILL the biggest Groups in the World
Meaning 4th Gen is the first Generation of Kpop to not even dominate their own Era
And 3rd Gen dominated not only their own Era but also the next generations