Most Helpful Girl
Yes, personality does matter because it determines how the person is.
Most Helpful Guy
Both of them matter. Looks is what initially attracts you to a person, while the personality is what make you stay with that person through thick and thin. A relationship that is based on looks is trouble in the making, because looks is the very first things that goes away as we age. But how a person treat others, usually stays the same until that person dies.
Good Look + Good Personality = This person is the The Perfect Partner
Average Looks + Good Personality = This person is a Good Partner
Good Looks + Shitty Personality = This person is good for ONS and Short term relationships (to flaunt around), but is not someone who you'll let meet the family nor would even consider marrying.
Average Looks + Shitty Personality = This person needs to lower their standards because their not getting any respectable girl/guy past a 6/10 unless they meet someone with an equally shitty personality.
Ugly Looks + Shitty Personality = This person should just go home and plant sweet potatoes. They're a lost cause.