I chose MUFFINS, why you ask???? Well who doesnt like muffins? haha
on a serious note I have varied between filter socks and the plastic mesh filter socks for years and had pretty decent results.
When I had my 75g with a 20long sump I used strictly mesh and did pretty good, i think i could of never changed it out and been fine.
Now that I have my current set up I really noticed how much it is needed. I feed various foods and you really see how much is sucked into the overflow and down into the sump when you dont use anything. Then it needs to be sucked out when you do water changes or it it just decays. I added my filter sock hanger and been happy ever since. I purchased four filter socks and two mesh ones, i forget the micron but BRS sells them, I have to change the filter socks weekly and could let the mesh ones go monthly but my OCD kicks in and usually do it monthly anyways.
I have noticed the filter socks catch way more everything, algae, uneaten food, copepods, whatever
but the mesh ones let a bit more through, when I went away for ten days to mexico i put the mesh filter in and it was fine
I am not sure what is best so i change it up every once in awhile