The 99 appeals to traditionalists while the Model 88 was an attempt to incorporate modernity in a lever action. I own a Model 88 and I've owned three 99s, a .308 and two .243s. My M88 in .308, is hands down, far more accurate and it will group with many bolt actions. Using ordinary factory loads and handloads made from leftover bullets and powders, I have no trouble putting three rounds in a half-inch group from the 100 yard bench and using a scope.
Fortunately, you shouldn't have to choose one over the other when you can own both. 88s in top shape are fetching around $1000.00 while you can double that for one in .358 Win.
