Doppelgangers are generally more expensive than bass. Turbot and bass are both tasty fish, but their prices and quality vary by region, market and season. Here are some of the factors that may affect the price:

1. Season and market: Bass may be cheaper than turbot in certain seasons and markets because bass is more readily available locally, while turbot may need to be transported from other areas and therefore cost more.

2. Region: Bass may be more popular than turbot in some regions and therefore may be less expensive. Conversely, turbot may be more popular and more expensive in some regions.

3. Quality: The quality of bass and turbot can also affect the price. If the bass or turbot are of good quality, the price may be higher because they are more popular.

Overall, turbot is usually regarded as a high-grade fish with tasty, tender and flavorful meat. Perch, on the other hand, while also a tasty fish, is relatively more affordable. However, the exact difference in price and quality will also be affected by the factors mentioned above, and therefore need to be analyzed specifically for comparison.