Swaged balls are usually very uniform, no worry about voids, sprus, etc...and IMO, Hornady and Speer make the best swaged balls...however, they're fairly expensive where cast balls are much less expensive once you make the investment.
But since I don't cast my own, I've used Hornady balls for years in various calibers except .62cal and that's because they don't make .62cal swaged balls...so I get those as cast balls from Eddie May in Georgia and they're excellent.
In truth, for the level of accuracy I require in my weekend fun shooting plus my hunting seasons, you could load my rifles for me behind my back and I'd never notice the difference between swaged & cast balls at the target.