Better by what measure? I've been using X1 in various forms for over 10 years and never had a problem.
If it does what you want and comes in the colour you want then why change!
In what would could things have "moved on"? Physics hasn't changed, so unless you're interested in changing how you cool with fluid (graphene fluids or immersion cooling, for instance) then nothing is ever going to be better than water within the scope of home PC watercooling.X1 has been great, you'll get no argument from me here but surely things have moved on a bit.