Living in Spain.
Just another tip. The're just 2 places to live where you will pay less taxes for your income: Ceuta and Melilla.
The islands have regular taxes for your income.
About "buying": Balearic's have regular VAT like mainland (21%) and Canary's have a reduced VAT (7%).
That's about taxes. Cost of living is another tale.
Cheers from a Spaniard.