The best channels are the ones that look nice.
They have good symmetry.
The longer a channel has been established, the more significant it is.
The trend is the direction of the channel.
Up channels tend to break down:
Down channels tend to break up:
Sometimes down channels break down & up channels break up. Rare, but it happens.
Trendy channels have good price and time symmetry with harmonic trend waves and harmonic pullbacks.