I was used to initially using
Take off thrust to acceleration altitude
N1-bug up to clean up
Then flight level change
The next operator advocated
take off thrust
N1-bug up
VNAV (or flight level change if deemed appropriate, such as when you forget to put in 250/10000)
A recent operator has used
Take off thrust
N1-flight level change-set flaps up speed to clean up
VNAV/speed intervene thereafter.
I'm particularly curious about the benefit of selecting N1, and then level change immediately after. Especially as acceleration is generally 800-1000', and always above 400'.