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, and around 1,500 with a work account. A brand-new work account stays at a hundred a day for about 3 months.
Our address gets the rest out when your limit runs out
You can send everything from our own address, which has no daily cap, or choose both so tickets leave from your Gmail when possible and from ours when your limit runs out. Guests receive the same ticket either way, but with our address the sender is ours. If replies should reach a different address, or you prefer your own mail server, set that in the email settings (your server needs its anti-spam setup: SPF, DKIM and DMARC).
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.