The Anderson PP are good stuff if you're looking for a solid connection. I like the fact that they dovetail together on the sides so you get a solid pair (red/black) for connecting to another pair.
I got started with them 30 years ago in r/c racing because they are low loss connectors. They're probably overkill and too expensive for most model train uses, but for something like a one-off lift-out that will only occasionally need to be disconnected, I think they're great.
