Best class is pure 2hander. Simple as that. Then polearm very close. Hybrids are fun, but not best. Str is superior to agi and hybrids usually need good agi to get good wpf for both. I will say 24/15 2h is the Class. My main is a shielder, but its sooo inferior in any way to those. With the new versions of crpg the gap is even bigger, since blocking manually its not that hard and shields last for like 3 axe hits these day.
But the advantages of the 2handers are way stronger than those 3 "free blocks". First, longer reach, that is clear. Massive damage compared to 1h. Speed advantage for not carrying a shield. Better animations. Way better surviality. Much better equipment at the same upkeep rate. A much funnier selection of weapons. The only real con is you are prone to ranged attacks, but with the massive rains of arrows nowadays you get killed with or without shield anyways..... Salute.