In my opinion all three headphones benefit from good amping.ofcoarse, which is why i want to see if others can relate to my experience from what i originally mentioned. the youtuber that was recommended for me to watch "Joshua Valour" kinda makes the LCD-X seem more worth it, however the way he mentions it almost sounds like a planar version of a DT1990 Pro which i dont want another pair of. i want variety. so im still kinda stuck at square one.
DT1990 Pro: if you like a bit of a treble bite and a very clear picture and you don't mind the slight bass roll off under 50Hz and a slightly analytical sound.
LCD2C: if you prefer a darker, warmer, more gentle sound, less pronounced treble. You are not after the ultimate clarity and prefer to relax with music.
LCDX: if weight is really not an issue and you are going for the Audeze sound adjusted for studio use. (In a way closer to DT1990 sound but without the sub bass roll off and a friendlier treble.)
This is obviously just my subjective opinion. I think all these three headphones are pretty great.