I think archers are worth it if only because of their decent h-t-h performance, gunners are useful for their morale reducing effect but are prone to rout when battle is joined close to the formation, especially if your fav tactic is to allow the enemy to 'collapse' your center and then enveloping the flanks with fast attack units.If you are attacking they are even less reliable if you are relying on them for longer range arty support..not only do they shoot you in the back they are likely to run coz all that empty space round them reminds them of their mammmas!
Bottom line: If defending (especially elevations) go with gunners, if attacking or on level ground go for archers.

And that is my two cents.

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To be happy it is necessary not to be too intelligent
- Flaubert-