What is the Difference between Heat Cutting and Ultrasonic Cutting?

What is the Difference between Heat Cutting and Ultrasonic Cutting?

Both heat cutting and ultrasonic cutting has sealing cutting effect, suitable for fabric with burr.

Ultrasonic Cutting:

has better cutting effect, the cutting and sealing effect is more smoothly   then effect of heat cutting.

Heat Cutting:

the cutting blade is electrical heating then cut the fabric, there will be a little smell.