Both should work well. Digital has some advantages as does analog but you won't know until you try them. Some receivers have nice dacs built in, some do not. You could go down the rabbit hole and find the specs for that marantz and the dac used and find the way it was implemented, but really, it gets a bit academic.
My suggestion would be, buy them both. Test them on your ears. They are cheap and if you end up with a spare unit, give it away to a friend or set it up in another room.
Just to be clear, you are looking at the Dac+ for the B+.
https://www.hifiberry.com/dacplus/
mm
