From O'Rielly.
Cartridge Oil Filter; MicroGard Oil Filters provide good engine protection using conventional motor oil for everyday normal driving conditions such as city and highway travel. Recommended for traditional oil and filter change intervals, typically 3,000 to 5,000 miles. Laboratory Test Performance per ISO 454812 13 grams dirt (MicroGard MGL51515), 95% efficient at 29 microns (Based on MicroGard MGL51356, MGL57060, MGL51515)
Cartridge Oil Filter; WIX Cartridge Oil Filters provide excellent engine protection using conventional and synthetic (when recommended by the OE vehicle manufacturer) motor oil for normal and severe driving conditions such as dirt roads, construction sites, stop and go traffic, short trips, interstate travel, throughout the OE manufactures recommended oil and filter change interval. WIX filters are recommended for OEM oil and filter change intervals.
Not sure why they don't give more details for the Wix as far as efficiency. Here is what it says for many of the Wix spin on filters.
18 grams dirt (WIX 51515), 99% efficient at 23 microns (Based on WIX 51515, WIX 51356, WIX 57060)