Based on frequency counts in the three long-running fantasy campaigns that inspired these template designs from me:
1. Swashbuckler & Wizard (tie)
3. Barbarian
4. Cleric & Knight (tie)
6. Druid, Martial Artist, Scout, & Thief (tie)
Artificer, Assassin, & Necromancer would go here
10. Bard & Holy Warrior (tie)
Justiciar & Scholar would go here
Shaman would go here
I've never had anybody want to play a demonologist, elementalist, innkeeper, or ninja.
I'd say that the "typical" four-member party has consisted of a cleric and a wizard for mystical support, plus
two of barbarian, knight, or swashbuckler for muscle. When I've had six starting out, I could count on
two of cleric, druid, or wizard for spells;
two of barbarian, knight, or swashbuckler for muscle; and
two of martial artist, scout, or thief for stealth. All the rest have been uncommon, seen solely in huge parties – although I hasten to add that I've had enough artificers, assassins, holy warriors, and necromancers that I wouldn't deem them
rare.