I have both... I love my Octagon 20 and I love my Hova-bator. They both preform the basic functions, hatching eggs. Questions you have to ask yourself:
1. How many eggs are you hatching? The Octagon 20 will be cramed full with 24 eggs, the Hova can fit 42 with the turner and more with out.
2. How much time do you spend with your bator? The Octagon 20 with turner is set and leave. Checking it a couple of times a day for temp and humidity. The Hova, I don't care what any one else says, you gotta watch it. Of course that depends on which thermostat it has (and there are the Wafer VS electronic arguments)
3. What are you hatching? Just chickens then then apples and oranges..
4. How much do you like to clean? The Octagon 20 is plastic. Soap and Water, then rinse, and spritz with a little bleach water and your done. Styrofoam, well theres going to be soaking and cleaning going on there.
I like both.. But if I have a small hatch, hard to hatch breed, shipped eggs, they are going in the
brinsea. Local eggs, or more common eggs then they are going in the Hova..
Of course if I had to choose... I would go with the
Brinsea 100%