Blackstone 1517 vs. 1883 — what's the difference?

Both are 28-inch two-burner Blackstones. The 1517 is the long-running base model with no hood and a rear grease management system; the 1883 adds an integrated hood and counter-height side shelves. Reviewers describe the cooking surfaces as essentially identical, with the choice coming down to whether you want the hood and shelves.