Both are good! But I'd say April! You can join in with the Spring Fest we have every year at Ebenezer Park and it's free to all crappie.com members, family and friends. Crappie will be on the banks spawning or heading to them. Depend on the weather and water temps and how bad they want to spawn. Glad you are planning to fish Lake Wylie and hope you the best of luck. Hope you can drop in on us and have some fun.