Change wheels or just tires?

Hello, I’m now working on the purchase of winter tyres for our S60 like many of you. I’m asking myself the basic question, whether I should buy only tyres and mount on the existing LM rims “Canaveral” instead of the summer tires or is it better for tyres and rims to prefer the purchase of the complete wheels? Do you have technical concerns for the tyre change that the tire does not get to get down from the rim once a year and to get out again or the rim does not get the salt in the winter? I’m grateful for tips, cu, Niels