The difference between 1H and 2H is 10 Accuracy, that's a max of +10% crit chance. One-handed style (the talent) does not grant anything to crits.
The status afflictions on crits are a chance, I believe - I'm not sure what the chance is, but I can check in the editor.
If there are any 1H weapons that inflict those status effects, I'm going to summon one tonight and try it. Regardless of the horrible numbers, I don't think it's going to be as good as using a 2Her with the same enchantment (or two weapons).
If ACC-DEF -5 or less, you are going to have 0% chance to crit, and 0% chance to cause those status effects, too.