Is there a benefit to waiting to publish your hub? I'd say definitely yes!
If you have spent a lot of time working on a hub its best to save it, so the following day you can look over it and cheeck for spelling and grammatical errors, ensure that you have sourced photos etc.
Does it affect your hub score? Well no, but in a way yes! I've noticed that while writing hubs, if my hub is better formatted and spell checked etc, the general score of the hub wil increase. I have had hubs begin on 70.
Waiting for the score to climb, well I think it's better to publish rather than wait on a score increase.