My rule of thumb is this (in order of most front end to least front end);
low profile cut stagger narrow wheels & no insert
low profile stagger narrow wheels & no insert
Mini spike wide wheel & insert
low profile cut stagger wide wheel and insert
I find the stagger rib, in any form, to be best on tracks where the surface is of a relatively similar grip level all round the lap.
As soon there are significant sections at different grip levels I go to Mini Spike fronts as I find they match the rear end performance more consistently over the different surfaces. Staggers, all types, sometimes work better than the rears causing the car to be unstable and other times don't work as well and the car understeers too much.
Hope that helps.
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