This may be different for you guys, but one of the biggest factors I keep in mind here when choosing what type of eggs to use is what kind of eggs are being used the most. Here it is either king eggs or brown eggs and then steelhead eggs, something with a bit of a different scent can trigger the fish. Especially in spring just about everybody uses brown eggs they are considered "gold" here, there are times when King or silver eggs will be the top producer even though they have already been dead for months. So if everybody is throwing king eggs it may be worth it to try a different kind, etc...