I'd say lightweight and featherweight are the most stacked divisions by a fair distance. The funny thing is that the lower weight classes generally have the best technical fighters in them because they can't usually rely on power, but because of the lack of KOs most people ignore them mostly. I mean DJ is maybe the most complete fighter there has ever been but he never gets the true adulation he deserves.
@DrRodo says Izzy is the 'Messi' of MMA when realistically DJ is much closer to that considering the fact that he is excellent across a range of martial arts but because he is small he'll never truly get the credit he deserves.
Sorry bit of tangent there but yeah LW has the best fighter in the World in it, probably 3 of the top 10 strikers in the UFC in it and just a crazy depth of quality fighters.