An incubator is a box with a heat source and a method of controlling the temperature.
Some are large, some are small. Some have fans , some don't. Some have automatic egg turning, some require you to turn the eggs by hand. Some use an electronic thermostat, some a wafer. Some are cheap, some cost a lot.
The one thing they all have in common is that they will hatch viable eggs if they are used properly! The notion that GQF Hovabators are some how better than comparably equipped Little Giants [or vice versa] is silly. Look inside them-they use the same type of critical components.
Anyway, decide what you want to spend, buy accordingly, REAd & FOLLOW THE DIRECTIONS and you'll soon have too many d*** chickens.