We always pigtail.
I once had an inspector tell me I was in violation of the Code!!
He actually took a connection apart in order to "teach me the right way."
The same inspector would not accept 30ft lbs of torque for 360 inch lbs (a real wizard).
I opened up a hot 4000A 480/277 service for him to inspect and demanded he put down his trusty aluminum Maglite. He looked at the busbars, then the light, and then rather sheepishly at me. He asked me to close the service back up, and never again gave me any trouble.