Any recommendations for a new set of tyres for a Defender 90?

I shall be using them mostly on the road (most of our roads are like B
Roads at best in Malta), but want greenlaning capability.

Any brands which are a sure hit? Or which I should definitely avoid?

I had Kellys recommended to me... I have the standard size of wheels
currently installed (15"?) with the original tyres. Could you also
please recommend a size of tyres?