It comes down to individual preference, so I recommend that you listen to both and decide. In my experience LCD-X is significantly better than LCD-2C. Both tried at the same time back in 2020, so I am writing based on distant memory.
I initially ordered LCD-2C, after having heard both. This was because I wanted a hi-end product coming from B&W P7 ver 2, but found it hard to afford LCD-X.
I woke up the next day restless that I did not like enough the LCD-2C- ended up cancelling the order and ordering the LCD-X.
To my ears 2C sounded all blended in, while X had very clear separation. X had higher detail representation (30% or more- I am always trying to make it tangible for my own understanding).
Many people talk about the higher mids dip, but I never found it a problem and I hear the sound very natural. Probably it is me that does not hear Harman curves as objectively correct.
X could be a bit flat and boring in the beginning, but after two days of brain burn-in, I found them very emotional and have rediscovered music- that is why I have hard time liking others meaningfully more to make me change my X (including 4z and 5) .
On some tracks, I use the oratory eq, to fire up low end and guitars. The down side is losing the snare impact and vocals become less natural. So, I use them without eq most of the time.
They can take any EQ though, if you have enough power on the AMP, because any EQ upwards needs to be balanced out with decreased pre-gain. I put +16 db under 150Hz and they melt my brain on hip hop like I cannot even describe… this of course is for short sessions. The point is that I can make anything with X, while I prefer it without EQ on well recorded tracks.
I will keep them until they break.