I’d go with Modernica. Interestingly enough, they actually bought the Original Eames fiberglass molds, and had been using those to make their “knockoffs”. So the Knockoff was more original than the genuine ones? Unfortunately those molds finally had to be remade, but at least they had the original to base the new molds off of.
These chairs went meant to be produced cheaply, so in a way the knock off holds the original intent as well.
I have a couple of “authentic” DWR Eames LCWs, black aniline die… they always make me nervous because the finish is fragile and they were expensive. I love them though, and I’m at the point in my life where I can afford the genuine article. But I was thinking about getting a set of the fiberglass shell chairs for the kitchen table, and even I was going to go Modernica.