I've used the OSMO. Not that great. It does a little better than just walking with the camera but you still see the up and down movements. I even got the "z axis" stabilizer for it but it still didn't give me the smoothness I was looking for. Plus you need a smartphone to use as your viewfinder/record. I noticed the connection between them would sometimes go out.
I don't know what your budget is but I've been very happy with the ZHIYUN Crane.