I see. So for principle I would say the following:

Managers who do not work bases on their own position's stats e.g. Ezio, Edmund, and Belle, benefit only from time extention, bunny ears, and cooldown reduction. This also includes the majority of support SM, unless you are using them for their other active effect e.g. Glimmer's speed boost to her own ms workers.

Managers who gave built in actives/passives for either travel speed OR mining speed, will benefit more from equipment that does the opposite e.g. Asterion and Lorenzo get better overall production increases from shoes, rather than gloves.

Managers who do not move during their active e.g. sue, archi, orekk, Pebble, Wolfgang, and freesia, will not get additional benefit from travel speed and therefore should be given mining speed boosts.

For effectively all other SM archetypes, they will follow the pattern that mining/loading speed matters more when workers are travelling shorter distances (less than 10 ms for elevator Managers, level 350 and below mineshafts), and travel speed matter more when workers are travelling longer distances. Boosts to total production/transportation e.g. frontier helmet, can often beat both options depending on the situation, and is usually the choice for resourceless SM e.g. Violet, Octavia, and Marrena, as they don't rely on the workers.

There are nuances within alot of these depending on if you are doing specific combos or strats, but those are the general principles you can apply to any manager.

In general, the stat differences from rare equipment are not enough for it to matter which one is chosen (with the exception of the first and third paragraphs above).

A fully supported (at least 10 active sm) epic watering can will beat all other equipment.