Your own address looks best
By default the ticket comes from you, so guests recognise the sender and can reply to you. The catch is that Google™ counts those messages against your daily limit, which is usually a hundred messages with a free account.
Our address gets the rest out when your limit runs out
You can let us send the remaining tickets from our own address. Guests receive their ticket the same day, with the same content, but the sender is ours and replies come to us.
The practical advice
For a list longer than your daily limit, start the day before, or turn on the fallback sender before you begin. Sending a test to yourself first costs nothing and catches most mistakes.