Apologies to the Ercalverse for going off topic, but I’m generally very satisfied with Roco universal couplers, positive, light action coupling, not too hard to uncouple, delay latch built in, and nicely close coupled. I’ve bought some HOfine hooks to fit to my locos, as an experiment, and the Marklin close couplers offer the facility to shunt with a magnetic pole (I like to be involved in operation, so hand throw points with Caboose Hobbies ground throws and so on).
I don’t operate fixed rakes, but if I did, I’d be tempted by Fleischmann profis (or more likely the cheap Chinese knockoffs!) as they seem more robust than Roco close couplers, but not really suitable for shunting as they require a good whack to bring them together (or so I’m told).