Buffalo, plains game, and maybe tuskless.
I've been to many parts of Zimbabwe and while many are excellent for one animal or another, not all are excellent in the Big 4 and plains game.
One area which is excellent for elephant, buffalo and plains game is Matetsi though, and in particular Unit 2 and Kazuma (which adjoins Unit 2). Unit 2 is now run by a superb professional hunter (don't tell him I said so) Guav Johnson, with whom I've hunted a number of times, and his brother Courtney (with whom you can actually have a conversation). I've taken elephant (55lbs) and buffalo there, as well as a good range of plains game. (If it matters, they are also one of the only places in Zimbabwe where you can hunt roan - they may get one or two permits a year). The sable is also superb throughout the Matetsi Units (mine came to 44 5/8, which at the time was superb for wild sable), and they do hunt tuskless there.
I would add that Matetsi, as some have said, is close to Victoria Falls, so no need for a day's drive to get there, the airport is excellent, there are lots of flights, the Victoria Falls Hotel will make you think you are back in the 19th century having dinner with Selous at the next table, and, of course, the Falls are one of the modern wonders of the world.
FWIW, I like Unit 2, as you can probably tell, but I have no financial or other interest in it. I'm going back there in 2027 to hunt lion and tuskless . . .