Powdered or liquid CYA which is best ?

They are both the same, neither is "better". I have always used granules and then topped up for splash out during the swim season by using tabs when we are away for a week or moe....

Liquid is quicker, kind of like instant gratification - but not worth the extra coast in my book.
 
Liquid chlorine is significantly more expensive then solid CYA.

From Recommended Pool Chemicals - Trouble Free Pool

Solid/granular cyanuric acid (CYA) should be placed in a sock and the sock put in the skimmer basket or suspended in front of a pool return. After adding CYA you should leave the pump running for 24 hours and not backwash/clean the filter for a week. Squeezing the sock periodically will help it to dissolve faster. Test and dose chemicals in your pool assuming the amount of CYA added is in the pool according to Poolmath. CYA can be tested the day after it is fully dissolved from the sock.



 
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