For mostly sod a molboard plow is probably best, there are times a chisel would be nice but you'd want the molboard more often.
A 1066 here in my clay has enough with a 4 bottom plow.
But most people have easier soil so a 5 bottom might work.
On the other hand, sod you bale and pack down hard can take a lot more power to plow up.... People always want the biggest plow they can possibly get, then rip the guts out of their old tractor that isn't quite factory new any more. You are plowing mqybe 10 acres a year on your rotation, why beat the crap out of your tractor with a big plow.....
A semi mounted plow is a good thing.