If it was me I would have the full spa treatment. For a dweller that age with just swirlies as you say, the amount of metal lost to polish up like new will be next to nothing. When 60's and 70's Rolex examples appear with thin lugs due to removal of deep stuff, I think the consensus would be to avoid or adjust the price down. Certainly something like a comex with its battle scars would go nowhere near a polisher. For yours I would think it would be a real pleasure to get your watch back looking like new.