Easy. If the working load is lower than the working load for the smaller unit, it's worth the price saving. If the working load is near or higher than that, go bigger. The specs are readily available but make it about 880#.
With these clutches, as I recall, abrasion of the line is not an issue. Nor, if I recall the feel, is it much easier to release either under loads in the range of the smaller unit.
G'luck
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