I have owned 2 hornets made by Anschutz and a TC Contender carbine. All have been excellent, and I still have an Anschutz 1433 fullstock carbine.
Current manufacturers include Browning, CZ, Ruger, Zastava ( Remington and Charles Daly were the same rifle made by Zastava ) , and a bunch of more obscure european manufacturers. The H&R single shot is built to appeal to a cheap utility market, and the lack of quality shows IMHO.
Accuracy has nothing whatever to do with barrel length. Most hornets will have a barrel length of 22" or so, longer or shorter gives a little more or less velocity and changes the handling characteristics, but accuracy has more to do with barrel profile, how tight / loose the chamber is, and condition of the bore and muzzle. Many hornets have quite "loose" chambers and benefit from neck sized reloads. I have not shot a K hornet but see no reason for them when I have three .222 Remingons in my rack.
Of current .22H offerings, I would personally choose the CZ rifle. Decent quality and a good adjustable trigger.