My son started to use the yaolan when he was about 4 months old. My hubby and I tried the yaolan as my son had difficulty sleeping at night. It turned out to be very useful, and even minimised my son's gastro-oesophageal reflux.
The standing one is better - as it is mobile, you can move it to different rooms. However, you need to be careful and make sure the joints are properly fixed - once we dismantled it and then did not fix it back properly, and my son nearly crash-land to the floor when the top portion fell off.