I'm a fan of the bandette. Stays on the leg and will expand if you miss a bird with leg growing larger than the band. They're just a good easy reusable product. I can open one and hold open with two fingers on one hand then grab the bird with both hands, hold bird and slip on the bandette that was still opened by two fingers. Wide band with large easy read numbers and enough color choices for even more quick reference identifiers.
To clarify, you want the band a little loose but on growing birds it can and will still expand and not cause leg issues. The band should be replace for larger one but makes for not feeling I have to constantly check the bands. How stressful would that be with a few dozen or hundred growing birds if using zip ties?