i do not have al1x or ck1x but have the 2 before it - ue630x (5 years), ua6800x (2.5 years)
just looking at the specs for ck1x and al1x, main differences:
C has 3x2.0a hdmi; A has 2x 2.0 + 2x 2.0a (total 4).
C does not have audio elix prism enhancement like A, but both are capable of dolby digital only.
C can do HLG while A can do HDR10 only.
C has better bluetooth.
C is lighter than A
C does not have rs23s like A.
C is android9, A is android8.
both are smart, AndroidTV with google playstore, youtube 4k, browser, etc.
like ua6800x, C and A should have the unifitv app in playstore, works fine.
https://my.sharp/compare/productmy exp with sharp TVs is good, no trouble so far.
but keep in mind after 5 years, there will be no more android updates.
i.e., best to buy a tv with newest android version.
Thanks for your comment..since the function doesnt varies much, in that case, ill go for CK1X..found cheapest prize in lazada 2699..normal around 3k...