Is a 2000-piece puzzle worth it over 1000 pieces?

It depends on how much sustained challenge you want. The 2000-piece Buffalo Games title in this roundup includes a reference poster, which reviewers consider important at that count, and it spreads to roughly 38.5 by 26.5 inches, so you need a large, dedicated surface. If table space or time is limited, a 1000-piece puzzle is the more practical choice.