Which would you say is the best grain free most economical dry cat food?

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Usually on Royal Canin which cats love. Recently tried Sanabelle which they don't like. Any other suggestions?

Mine eat thrive which is 90% chicken and no grains

Sainsburys own brand is very good. My cat has stopped eating it for some reason.
She now has meowing heads purrnickety which isn't strictly grain free ( it has some oats) it's not that cheap either!
Bloody cat

here

Purizon gets good reviews too

We feed Arden Grange - works well for ours.

Link doesn't work for me

What about this one?
sainsbury

Yes that looks ok too. We don't have a Sainsbury's near us.

https://www.sainsburys.co.uk/shop/gb/groceries/sainsburys-complete-dry-hypoallergenic-recipe-with-fresh-chicken-1-years-adult-800g does this work?

I mostly buy Purizon from zooplus online as my previous cat had an allergy to grain and thrived on this stuff so we still use it even though we lost the older boy a couple of years ago.