A good rule of thumb is late March for the Black Crappie and mid April for the White Crappie. The Black Crappie have been more consistant in the past couple of years as weather/water conditions have taken its toll on the White Crappie spawn lately...ie...that is the primary reason for the new 20 fish limit on Ky this year.
Big Bear is a very nice resort as is The Moor's. If I were choosing I would probably go with The Moor's as the staff there are more user friendly in my opinion.
Given the recent past history and the increase in the numbers of Black Crappie here I would opt for the late March period. I would also recommend that you get a good Crappie guide for the first day here...Rodney Hairgrove guides out of Big Bear and would be an excellent guide for you...but you need to get your booking in...for both lodging and guide....that is a busy time of year here for Crappie and Bass anglers.