haha, im not the pro here so maybe someone better can comment. However for what is worth, i find the LSX to be very balanced throughout and might get a little boring, soundstage is also narrower(pointed out by aegis). The K10 engages me a bit more and has a wider soundstage. Both are excellent iems and considering LSX has a discount its not a bad deal
If you want a TOTL CIEM that's an all-rounder, the K10 will be hard to beat (the Wizard design is also something to die for). The MH334 (pair it with the Toxic Black Widow to experience audio nirvana) sounds wonderful with 90% of one's music collection, but doesn't fare too well with classical stuff, due to its less than extended treble.
If you happen to change your mind & decide to go for a universal, then look no further than the TG334. If you've noticed, there's going to be a meet hosted by Gavin of Tralucent Audio. Do audition the Ref.1 if you have the time. Its another good option, IMO.
At the end of the day, all TOTL (C)IEMs excel tremendously at their strengths, but their respective signatures may not appeal to some. Do take your time to audition thoroughly before taking the plunge, as you know, such stuff don't come cheap.
Also, its quite a waste not to pair such earphones with a decent source, at least. It doesn't make sense to me at all for let's say, a FitEar user using his/her handphone to listen to music. There are very good & budget DAPs out there like the Fiio X5 & iBasso DX90. Of course, the ultimate one to get is the AK240, but agreeing with its price tag is another matter altogether.