I would want to know aswell :)
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If you can chain 5's without having to stop due to pirates and crap I've heard of pretty obscene numbers from LP from 5's. Having multiple toons to decline/accept multiple missions helps with this a bit. If you are slow and have to stop a lot then being able to chain 4's is probably better. I had a period where I would bounce back and forth using 4's to get my tags and 5's to get LP to make stuff.
I was at the point with 4 (normal) ravens and a Noctis that I could blow up missions just about as fast as I could fly through the gates/rooms and I never saw the return some folks are claiming from anomalies/5's. For that matter, I never saw the return people were claiming from chaining 4's either. Then again, I suppose these folks were flying the exact right missions for the best drops/salvage to make the highest-selling items and had manufacturing options that I didn't have, which I'm sure isn't a trivial difference.