I recommend this Brit paste
My cat is picky both with food and these kinds of pastes, but he really enjoys this one.
A downside is the large amount of oil after opening – I got it all over myself and couldn’t mix the oil with the paste properly, even after squeezing and kneading the tube.
On the plus side, we’ve been using this paste for a while now and I can see an improvement in my cat’s fur (he’s long-haired).
He sheds less.
It’s softer and looks healthier.