Filling in 60 points of Scum. 5 Binarye Pirates or 3 Cartel Marauders?

Depends on what the other 40 points is...

Y-Wing TLT x2 + Binayre Pirate

Could be Latts. Could be Talonbane. I keep coming up with about 40 points of something that needs semi swarm support.

If it's Latts, I'd say take the banana pirates. If Talonbane, you need some stronger support because he's a glass hammer. I'd suggest a big ship to support TBC so that your opponent has to pick a threat to deal with first. If Talon and goes under the bus then at least you have something hard to counter with. If they go for the other threat, talonbane does his thing.