I find that the climate is much the same Adelaide or Perth. Milder winters in Perth. Cost of living - - not the difference there used to be & utility bills are cheaper in Perth. Electric not privatised as in SA.
If you want to live close to the beaches in WA look at Rockingham, Port Kennedy & Mandurah. There is a fast electric train from Mandurah to Perth, takes 48mins - - less from Rockingham.