I spend a lot of time in Portugal and a Kebab style squid with green peppers, prawns, tomatoes, chourico and prawns cooked on the charcoal grill is my dish of choice. I like squid served in a variety of ways but not so much in ink.
Good squid should not be rubbery (maybe over cooked), but maybe a bit chewy. It is normally white although you can eat small squid cooked in the oven It is normally cooked on a charcoal grill, and my husband does a wonderful stew type dish
Serving it in rings in batter is a waste of time as it could be anything in the batter and it is tasteless.
To get good cod now in the UK is very difficult and expensive. I like it thick, with large flacks. Again serving it in batter you need good thick cod to get the flavour not these thin frozen fillets sold in most fish and chip shops.
There are lots of variety of fish available now which are good and I like sea bass and sea bream