Creep Score or Gold
Consider that: 10 CS on a jungler could only be 70 gold from 10 different 7 gold small monsters. 10 CS on a jungler could also be 400 gold from 10 different 40 gold big monsters.
Similarly at level 1: 3 melee minions give you 19 gold a piece for 57 total. 3 caster minions give you 14 gold a piece for 42 total, 4 would give 56 total.
Which is more valuable as information? Which would you prefer to see in the scoreboard?