Most of the Maplestory warrior classes are basically the same during 2nd job. All of them use Power Strike and Slash Blast as their main attacks. Basically the differences can be summed up in two areas: skills and weapon choices. The main skill difference is that Fighters get Rage, which boosts your party's weapon attack by 10. As it is free except for -10 wep def, which is not going to impact the damage you take much at all, takes no use slots and increases each party member's damage by several hundreds that during 2nd job this is strongly appreciated.
The other classes can give themselves a weapon attack boost as well, but need items(cheap maplestory mesos) to do so. Fighters also get Power Guard, reducing touch damage by 40% and deals it back to the monster. This is the main reason why Fighters/Crusaders are considered soloers is because this reduces pot costs immensely.
Pages get Threaten, a skill that lowers the enemies' weapon defense and Maplestory(Maplestory powerleveling) weapon attack by 20, this is mostly used to lower damage dealt to you. Pages also get Power Guard, reducing touch damage by 40% and deals it back to the monster. This is one of the main reason why Pages/WKs are considered soloers is because this reduces pot costs immensely. Of course, constant KB and Ice Charge helps also to the soloing factor.