We've used multiple brands of edge-creasing machines over the past 10 years, the best one we've found is Mason's electric creasing. The core part of this machine is the large resistor inside, indicating the high-tech control of temperature.
As an electric creasing, a temperature of over 500 degrees is required to achieve a smooth edge oil ironing, this machine can achieve at least 500 degrees with the setting from 5-8. And for edge decorative lines, without stable temperature control, you'll either fail to create clear lines or risk melting the leather.