I have used air bags and Timbrens in the past and I'll be using Timbrens for now on. So much easier to use, they only engage when you need them.
If you do go with airbags swing for the integrated compressor. I didn't. I would air mine up to 50 lbs before we left the house. Once at the CG we would want to drive somewhere in the area. 50 lbs in the bags unloaded made for a rough ride. So I started carrying a small compressor. What a pain airing them back up at the CG.
After 6 years in use one started to leak. Another pain. That's when I discovered Timbrens. I'll never look back.