I have some fine nets I use for live food. I think I got them from Florida Farms. I have some specialized nets to avoid harming Corys. I have a bunch of netting material that I use for various purposes, mainly cleaning and maintenance.
I like having an assortment of rounded and rectangular nets.
Honestly, I do not like capturing most critters with nets that is kind of a last resort for me.
When I use a net I usually go with a fine white mesh ( not quite as fine as brine shrimp net ) and put the seam on the "outside" of the net. The finer mesh seems to support the fish better with less damage. Also, I have no had any issues with corys or discus getting spines stuck in that kind of netting. I don't have any of the other cats or plecos so your mileage may vary as it were. Getting the fish into a submerged container is better but often just not practical.