I use the 3 flag/whole belt falls off style. I like them best. Seems like they are easiest and quickest to get back on and you don’t have to search for random flags to put back on the belt.
We did our gutters in 2019. We went with Fischer Bros. contact@fischerbrosllc.com 608-769-5790
Feel free to give me a call if you want any other info on what we/they did. 563-927-1118