Trying to compare apples to oranges is tricky.
If space is your problem,then you can always use the same rod and change the reels out.That way,although not perfect,you can have your cake and eat it too.
The good part of copper compared to leadcore is the amount of line that you can spool onto your reel.This allows you to go deeper and it will alow the salmon to make a longer run without getting spooled.
What I like about leadcore is the color code system and the way it runs from the side riggers.
No matter what you choose,you will always miss the one that you did not bring.