Yes, the 4 in 1 is perfect for picking up and carrying thick brush and small trees. My neighbor has one and he swears by it as the best part of his tractor. I considered getting one for my loader, but tested out a few at an auction the other day. What I learned was that it's impossible to see what the bucket is doing. You will open it and put it into position, but you have no idea what is happening when it closes. Either you get it or you don't. You wont know until you try to lift it. One issue that my neighbor has had is with the different thickness of the logs and trees he picks up. One side of the bucket will clamp down on the log, but the other side can't get down far enough to make contact. So while he's carrying the log, it spins around and at least one time, it twisted his bucket pretty bad. He said it took all day with the torch to beat it back into shope.
Since I would have to buy a 4 in 1 bucket or grapple either way, I figured the grapple was much better. There are several different types of grapples, so it's just a matter of how much you want to spend, how much lift that your loader has and how much use it will get. I went comercial for mine and expect it to be here in about two weeks.
Good luck,
Eddie