I think the corrug. steel columns with the round holes are my favorite. Louvers are a flow choke. Plastic is plastic, but prob cleaner/rounder/consistent than metal from a mfg point of view?
Louvers give more flow area (meaning less delta-p) IF they are formed well. If they are barely opened up due to bad manufacturing then it could cause flow resistance, which means more delta-p across the filter can cause the bypass valve to open when it shouldn't.
This forum has seen very few eCore center tube issues over the last many years. I think the designers & manufacturers took a while in the early days to figure it all out and got it tweaked pretty well these days. Reducing the eCore tube openings and tightening up the pleat spacing was the key to prevent eCore type failures seen in the early days when they hit the market.
AC Delco going with metal end caps is a nice upgrade IMO. Filter looks well constructed IMO. Thanks for the C&P.