I use Delta 400 interchangable with Legacy pro.
Hp5+ has a different signature.
Well it's more about "focussing" on just a few emulsions. D400 isn't available in sheet form, so I'm HP5+ prone, makes processing times sync up so I can process multiple formats at the same time in the same tank.
Delta3200 isn't available in sheet either, so I shoot HP5+ pushed and it comes out really well, so it's so flexible, I like just keeping it simple if possible. I've never shot D400, I'm scared I'll like it too much haha
But I always shoot Neopan400@800 so Not sure if Delta400 would like that as much.
~Stone | "...of course, that's just my opinion. I could be wrong."~Dennis Miller