I'm a little confused.. Your plant looked weeks away from harvest yet you are hanging it already when buds have not even formed?
And the other plant is at least two weeks away, at least!
You need to look for the first signs.
1.buds have began to slow down growth, no new budlets forming.
2. Pistols are not producing any more white ones
3.pistils are turning brown with maturity and ripening.
4. Leaves may start to change colour to yellow or purple or start to fall off.
5.trichomes with a magnifying glass are all cloudy, some are turning Amber (it's most people's desired harvest window)
6.smell is strong and pungent (not always, depends on strain and grow environment)