Vocabulary is easily the most overrated aspect of "lyricism". It matters, but what you do with the words you use, matters far more. To me, DMX paints a better picture with his words than Banks. I visualize what X is saying, his content is more introspective, he's more witty (not in a punchline way) and a far better storyteller. He's one of the best crime storytellers in rap history, actually. I'm not mad at you having Banks over X lyrically, because Banks is better with syllables and punchlines. Which, if that's how you judge lyricism, you would be correct. That's just not how I do it.
X comp to me as a lyricist is Scarface. Papoose uses way more syllables, punchlines, metaphors, etc than Scarface. He's nowhere near the lyricist Scarface is, imo.
Not a 1:1 comparison but look at somebody like Freddy Gibbs.
He's a lyricist, he's a decent song writer, has that aggressive walk you down type flow, versatile enough but he maxes out on that spectrum below a lot of guys, I think even his biggest fans would tell you that. I would say someone like Pac or Face might even max out a tier below DMX on that front, yet they are still very dope lyrically.