I have shot both, swaged and cast, and have come to prefer cast. I buy commercial cast and they are cheaper than swaged and come in a wider variety of calibers. For example, shooting a pseudo .54 cal rifle, all I could find in swaged was .530 and .535– in cast I can easily find .520 , .526 , .530 and .535.
Btw, my one particular rifle prefers the .520 (which really makes it a .53 cal)
There’s something to the argument in re work hardened lead balls. I nave noticed swaged lead tends to fragment more than cast. Cast seems to hold together more on expansion based on my casual range work where I have recovered projectiles. I have not recovered any round balls from deer carcasses because all kills have been pass - throughs so far. And it’s moot because I stopped using swaged anyway. I can attest that exit holes have consistently been noticeably larger than entry and no projectile fragments themselves nor evidence of such fragmentation was ever observed.
Of course, other’s mileage may vary.