I really like my SS china cap strainers on the output side of my 20 gal SS boil kettle. I usually do 10 gallon batches.
The china cap design has a lot more surface area for straining than a plastic funnel with a 3 inch dia mesh screen, a bazooka screen, or even some of those fancy, and expensive, boil kettle false bottoms. The only thing with more surface area might be a extra fine mesh nylon strainer bag.
A SS china cap strainer is easily sanitized before use by dunking it in my bucket of starsan.
It really reduces wort loss, strains out the hop particles, and aerates wort all at the same time during the transfer process.
It is also a time-saver since it is on the outside of the kettle.
Anytime the screen starts to get overwhelmed, I just turn off the spigot and give the china cap a few good swirls and a few shakes and end up with a nice compact green ball of play-doh-like hops which I then dispose of properly and then get right back to straining and transferring.
The Coarse and Fine strainers are just drilled holes in a SS funnel--they're good for larger particles like fruit peels, and whole or leaf hops, but not pelletized hops.
The Bullion (extra fine mesh) strainers are ideal for straining pelletized hops.
One cool thing about china cap strainers is that they are stackable, i.e., each one can fit on top of and within the other, so you can strain in series without taking up a lot of space. Plus, the strainers have a good clip on one end and a long handle on the other end so it fits right on the bucket so I don't have to keep holding it--I can't do that with my large plastic funnel.