It’s not super secret, @Bobothewizard although this information is not in the game. You could find it easily enough in the wiki. I don’t know if it is already updated.
There are a few factors you need to consider.
The most important in this case are the ranged damage multiplier and the melee dmg modifier. Archers have a higher ranged dmg modifier and a lower melee dmg modifier. I knew these pre 3.0, but with the update they changed, but the principle likely remains the same. Maybe someone can tell them.
Then you need to see the bonus per point the thrall gains when you level it up, but in this case this is not very important since they are both of the same faction and values shouldn’t differ much. When you level up an archer, you want to increase agility, as this is the stat that will bost the damage delivered by bows (and agility class weapons like daggers). Feed it accordingly.
When you level up a fighter, if you are going for a strenght build, you want to boost strenght that increases the dmg of 2h swords, maces etc. Feed it accordingly.

RHTS fighters will be better melee warriors, generally, but they also had quite a high ranged dmg multiplier, superior to almost all t4 archers from other factions.
Equip them with gear favoring their function.
I don’t remember if their base HP is the same. I think fighters had it slightly higher.

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