It depends on a few things really. Grana is perhaps better but you will need more inventory space. Grana is also a long distance from things unless you are questing/ based down there. Ross Sea/ Margoria will have a slightly better relic drop rate average still, twice as fast fishing and Margoria still king for distance bonus to Valencia with desert buff etc. But requires large inventory. All this is for passive fishing. Velia gives a high % of both yellow and blue species while Grana has a large % of white and green species. They blue blue species are less than other Kama waters. The best freshwater passive fishing would remain Kama1 tables (B,C&D) as mentioned, they have a slightly higher relic drop rate from testing so far because relics make up such a high % of silver income from fishing, especially now. There are a lot of factors but the main thing for passive fishing is ensuring empty slots until the end of the session to accommodate any relic drop chances. That comes down to inventory space (high trash/ white with auto-fishing helps retain slots), rod durability (does it last to fill the inventory, fishing speed (Exhausted is slow but doesn't matter if inventory is filled by the end of the session), convenience is really important to most players also. Why Heidel remains a popular choice and high trash/ white good for smaller inventory.