All 3rd jobs are at lv 45 requirement at Locus Marsh, I'll only provide info that I know / Experienced while playing CN dragon nest.
Warrior -> Sword Master -> Gladiator ( Physical ) / Moon Lord ( Magic ) - Ok in parties
Gladiator : Strong defensives and heavy melee dmg, average aoe skills, High damage, able to chain combos easily. Lack Super armor skills, easy to cancel his skills if interupted.
Moon Lord : Strong magic damage, Good aoe skills, able to chain combos easily, Good for boss soloing. Cast time on skills take a bit long, average damage.
http://forum.mmosite.com/thread/2/21...8b93913-1.html
Warrior -> Mercenary -> Barbarian ( Axe ) / Destroyer ( Hammer ) - Not wanted in parties Unless you have strong Armor breaking gears.
Pros : Able to combo and break defense, average aoe, strong 1v1 class, Has buff and debuff howls, Strong super armor, Hard to cancel his attacks.
Cons : Average damage, Slow cast time, Not enough burst damage.
http://forum.mmosite.com/thread/2/21...f662213-1.html
Cleric -> Priest -> Saint ( Defensive ) / Inquisitor ( Offensive ) - Wanted mostly in parties
http://forum.mmosite.com/thread/2/21...415ac13-1.html
Cleric -> Paladin -> Guardian ( Defensive ) / Crusader ( Offensive ) - Wanted mostly in parties
http://forum.mmosite.com/thread/2/21...b906013-1.html
Archer -> Bow Master -> Sniper ( Critical damage and Physical ) / Artillery ( Magic and Aoe ) - Wanted in parties only if u have strong gears
http://forum.mmosite.com/thread/2/21...3bc8013-1.html
Archer -> Arcobat -> Tempest ( Defensive ) / Wind Walker ( Offensive ) - Not wanted in parties
http://forum.mmosite.com/thread/2/21...be8f513-1.html
Sorceress -> Elemental Lord -> Undrine ( Ice ) / Salamanda ( Fire ) - Ok in parties
http://forum.mmosite.com/thread/2/21...32cfc13-1.html
Sorceress -> Force User -> Majesy ( Dark and Chaos ) / Smasher ( Time and lazer ) - Most wanted in parties for burst damage.
http://forum.mmosite.com/thread/2/21...6efca13-1.html