Making your own incubator is incredibly easy:
1. buy a styrofoam cooler, a foot or so of heat tape from reptile basics (they will wire it for you), some aluminum foil tape, and a thermostat (preferably something like the herpstat intro +)
2. Using the foil tape, tape the heat tape into the cooler
3. Pass the heat tape cord out of the cooler and plug it into the thermostat
4. Place the thermostat's probe inside the cooler and set the thermostat to the desired incubation temperature.
5. Add eggs
If I had to chose between the 2 you listed I would go with the hovabator, but personally I wouldn't trust either of them.