If you're preparing to travel or if you're in the midst of traveling, you should avoid the Galaxy Note 9 Pie beta.
Again, the Galaxy Note 9 Pie beta is plagued with a variety of bugs and performance issues. There's also a chance the beta bricks your device or wipes the data stored on your phone.
Having a full functional phone is important when you're traveling in a place you've never been or during an important business trip.
If the Galaxy Note 9 is your only phone, it's a good idea to stay on official software for the duration of your trip. There's no reason to jeopardize a fun family trip or important meeting.
You can always install it when you get back.