The auto-cleaning mesh nebulizers are not a good choice for us because there is no way to sterilize/sanitize them.
Unless you find one with a removable head for sterilizing, they should get a pass. I know they are tempting because they are so portable and easy, but infection risk is there

There is one newer light weight portable (but not hand held) nebulizer called the Pari eRapid. The head, with the mesh insert, comes apart for sterilizing. it is fast and quiet. The head is connected to the power source by a slender cord, and I can put it in my pocket and move around as I neb, but is's so fast I don't feel the need. It operates on batteries AC adapter (included.) It is expensive and my Medicare would not pay for it, but I got one because we travel a lot and I needed the compact size and flexibility. I am hoping it proves to be as durable as most of the Pari equipment I have owned over the last many years. My first big green Pari Vios lasted over 15 years.