Spock...It is the only Logical choice.
He was the best friend,confidant,conscience and the most human part of the show.
He was strong yet gentle.He was also emotionless which truly helped when I became a paramedic because there are times when you must remove emotion and deal with what is going on around you.
He also lived like a hundred and fifty years longer than Kirk so who really could anybody ever pick.
“When you say “It’s hard”, it actually means “I’m not strong enough to fight for it”. Stop saying its hard. Think positive!”