None of the above.
To properly power classes (etc.) against each other, you need a general framework of what PCs are expected to be able to do at level X.
For example, level 3 boundaries could be:
* avg. 15 dmg per round
* 50 damage to one enemy in a 1/fight big gun
* deal 15 dmg per enemy in a big area blast 1/fight
* blind an enemy for 2-3 turns
* give an enemy -2 to attacks until the end of the fight
* ...
Then, make sure that Fighter, Wizard and all other classes stay within this general framework, neither completely exceeding it nor falling behind hopelessly.
And of course, this is an art, not a science.
As a fairly simple example, you can design a class that can do a lot more single-target damage, but is somewhat of a glass cannon and has to be protected by other party members.
If you have a class like the Wizard, with hundreds of options, it's almost impossible to do perfectly. Just take a spell like mirror image - creative players will do ingenious things with it, others won't.
And of course, there is the issue of daily ressources vs. number of fights per day, which you have to solve in some way if this has to work.
To properly power classes (etc.) against each other, you need a general framework of what PCs are expected to be able to do at level X.
For example, level 3 boundaries could be:
* avg. 15 dmg per round
* 50 damage to one enemy in a 1/fight big gun
* deal 15 dmg per enemy in a big area blast 1/fight
* blind an enemy for 2-3 turns
* give an enemy -2 to attacks until the end of the fight
* ...
Then, make sure that Fighter, Wizard and all other classes stay within this general framework, neither completely exceeding it nor falling behind hopelessly.
And of course, this is an art, not a science.
As a fairly simple example, you can design a class that can do a lot more single-target damage, but is somewhat of a glass cannon and has to be protected by other party members.
If you have a class like the Wizard, with hundreds of options, it's almost impossible to do perfectly. Just take a spell like mirror image - creative players will do ingenious things with it, others won't.
And of course, there is the issue of daily ressources vs. number of fights per day, which you have to solve in some way if this has to work.