It's not always as simple as that. If two filters are constructed out of basically the same type of material, but one stops 10 micron particles and the other stops 20, the one at 20 will flow more oil.
However it is possible for a 10 micron filter to outflow a 20 micron filter, based on the media it is made out of. A fully synthetic media can filter small particles and flow very well, while a paper media can only do one or the other, so it's a compromise.
Most of the filters out there that claim to be made from synthetic fibers are actually a blended media though.
Finding out information on oil filters is a very tricky game too, because most manufacturers are terrible at giving out their technical info, and it's not cost effective to test oil filters ($750 each approximately!) so the average person can really only take them apart and comment on what they see, but can't say too much in regards to how it filters or how it flows oil without having it fully tested.