I think its just make a decision and stick to it, unless something really bad comes up like it did with M&S.
I was with Sainsburys for years before I moved to M&S and I wished I never moved. As AXA underwrite Sainsburys I cannot see them giving worse cover and conditions.
Sainsbury paid out thousands for Kocka over a period and never had a problem.
AXA have paid out for Sasa, also no problem.
I have to say that cat insurance gets more complicated the more you think about it, wish I was still niave and am shutting my mind to any thoughts of problems cos would worry myself to death and its not worth it.
The companies are also getting more sneakie but I would not go with any company that would only pay out £5000 or less. I prefer a straight amount as an excess, cos you know how much you are liable for no matter what the bill.
If my cat was 18 I would definately go with AXA.