My opinion is probably not worth a lot, but I believe the 410 is not a gun for a kid. It is a gun for an experienced shooter. Same with the 28. The 20 gauge is a much better choice.
The 12 is the most popular gauge and has more rounds available for it. Packaging is better too as there are more bulk packs available.
You usually see #3 buck in 20 gauge (20 - .25" pellets) defense loads. Older and smaller shooters that are more recoil sensitive would be better served with a 20. Recoil could be reduced a little more with an auto loader. Slug loads are 5/8 oz and 3/4 oz. I have even been looking at the 410 for a home defense shotgun. 5-000 buck in a 3" load is pretty formidable. I think I may have found a decent slug load for the 410. Still researching.
"I would not be an old man if I had not been an armed young man." JTJ
Patron Member NRA
"As democracy is perfected, the office of President represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be occupied by a downright fool and complete narcissistic moron."
--- H.L. Mencken, The Baltimore Evening Sun, July 26, 1920