When i did 99 wc it was before ivy, i trained on mages, yews and willows, out of them 2 trees, willows are obviously the fastest getting around 50k exp an hour, yews we're like 25-30k exp an hour and mages like 15k exp an hour, if you want a mixture of cash and exp i'd go for yews, but the new ivy is now the fastest method i believe.