I use a hexagon hot end, the latest AO version. The filament is a bit of a snug fit however works a treat most of the time. I had to print a fan duct to blow air over the fins and use a 40mm fan -
I like the way the heat canister and thermistor fit the hexagon - no tape required.
I believe spares are more readily available for the E3D and will possibly switch when my hex stops working. I think E3D have just bought out a light version as well.