Best Pipe Dope For Black Iron Gas Pipe

The title more or less says it all. I'm relocating a bunch of 3/4" black iron natural gas pipes that feed my boiler. I've used Oatey dope in the past (I used their conventional, non-teflon dope for gas pipes) and had decent results, but I'm wondering what the pros prefer. I have lots of big-box home stores and smaller hardware stores in my area, plus Amazon.

Thanks in advance.