Fast Verdict
Choose a travel eSIM if your phone is eSIM-ready, unlocked and you mainly need mobile data. Choose roaming if calls, SMS and keeping your Australian number simple matter more than the daily fee. Choose a local SIM if you are staying longer, want a local number, and do not mind sorting it after arrival.
The data-first option starts here: Europe 35 Areas eSIM plans.
Travel eSIM
Good for maps, messaging, booking apps, rideshare, translation and getting connected without finding a mobile store after a flight. You can usually keep your Australian SIM in the phone for your normal number while the eSIM handles travel data.
Watch for eSIM compatibility, carrier locks, coverage, validity, start rules and whether the plan is data-only. Check the compatibility checker before buying if you are not sure.
Australian Roaming
Roaming can be the easiest option when you need your regular number for calls and SMS, or when a short trip makes the daily cost acceptable. It is worth checking the exact destination zone, daily fee, included data and excess-use rules with your Australian carrier before you travel.
It can also trigger from small bits of overseas use, so do not leave it to airport-brain.
Local SIM Card
A local SIM can suit longer stays or travellers who need a local number. The trade-off is the arrival admin: finding a store, showing ID where required, swapping SIMs, and keeping track of the tiny Australian SIM that has chosen chaos.
The SIM Shop Take
If Europe 35 Areas is a short or medium trip and your phone is ready, a travel eSIM is usually the cleanest data setup. If calls and SMS are the main job, compare roaming carefully. If the trip is long and local admin matters, a local SIM may earn its keep.
Before checkout, read the install guide and the plan start guide so you know when to install and when the plan starts counting. If the eSIM installs but data does not work after landing, use the no-data troubleshooting guide before deleting anything.