Ryan,
As you can tell from the responses, there are a lot of different ways to debur parts. I have a couple of the deburring tools that you showed, and I don't use them much, because they just don't have a good feel. Also, some of them have balls on the end that are too large for #40 holes. However, I did buy a set of deburring tools from Home Depot that are the same as the one you showed, but smaller. This was a 4-pack of tools, each meant for a different type of metal (plastic, aluminum, brass, steel). My favorite tool is the yellow one, which is meant for plastic, I think. This has a very small tip and just feels right. I use this tool all of the time. Best $15 that I spent so far (ok, maybe not the best, but certainly a good purchase).
However, for general deburring of drilled holes, my tool of choice is an electric screw driver with a #40 countersink bit attached., much like David showed. I bought a small drill chuck from Harbor Freight that has a hex bit on the end, which fits the electric screw driver. Actually, I have two electric screw drivers, so when the battery goes dead, I have a screw driver to use while the other charges. I have already worn out two batteries on one screw driver, and it is actually cheaper to buy a new screw driver than another battery pack.
I have used a larger drill in my finger tips, and there are situations, where this is the best way to go, like the inside holes on the rib flanges, where it is hard to get the electric screw driver into (note, I also have a flexible extention, which sometimes helps).
I do not have a burr-away, simply because they are too darn expensive. There are places where they would really be useful, but not for $30-$40.
For edge deburring I prefer the vixen file, followed by a smaller file, followed by maybe the hook deburring tool, followed by a Scotch Brite pad. Some guys just go straight to the Scotch Brite wheel, or the Scotch Brite pads, your choice. BTW, you will appreciate it if you do a good job of deburring when you are reaching into the wing as far as you can while holding a three pound bucking bar and trying to pound a rivet with the gun in your other hand. If you arm comes out bleeding, you didn't do a good enough job.
So, as you can see, there are a lot of ways to debur a hole and other parts. No single tool is best. Each requires the right tool for the job. Or, for some of us the ability to make the wrong tool do an adequate job.
Cheers,
Tracy.