Reinn, Actually, since the shifu said both dates are good for your AD, you just have to choose a date that you like best. It IS afterall your big day and you should decide wat you like.
It is true that Fri will probably mean lesser pple appearing, but, you could negotiate with the hotel to start the dinner slightly later. There may be a cost, so, you may have to pay more. If its ok to start later, then you can print on your invite cards to inform them that dinner starts late, then more pple would go.