Braided or corrugated stainless, or copper flex for water lines? | Terry Love Plumbing Advice & Remodel DIY & Professional Forum

I was looking at some flex connectors available for my upcoming water heater install and I'm not sure what to use. Currently I have copper flex connection lines, but Home Depot seems to regard that as the last choice to use. They sell braided stainless lines and corrugated stainless flex lines - which one is best? I would have assumed braided is best, but they seem to cost less than the corrugates steel flex. Any thoughts?