I’d probably go with ERT just because they have more colors than black. I have three of the Blackhawk brand ones. They’ve been loaded for the past decade with occasional use. The elastic has held up fine over the years.
Design between the two looks pretty similar.
I only load two. I have very small hands and haven’t done any work to the port. I can do four but generally with a much lower success rate. I’ll get there eventually.
What about replacing the buttpad with Limbsaver Airtech model which should be an improvement over the factory buttpad? Limbsaver says the 10810 will fit the Comforttech stock.