Erm a 1H hybrid would be a grosse messer or whatever. Longsword is technically a 2H hybrid for polearms
Grosse messer is strictly 1h, when he says 1h hybrid, I'm pretty sure he means weapons like the Langes Messer, Fighting Axe, Military Sickle, etc.
Anyhow, the best 2h depends on how good YOU are and how you plan to use it. I prefer the Dadao, just because I think it looks cool masterworked with
Final Boss' Jarold's Heirloom texture pack!