short answer
an esim is often the better fit for fashion travel: it activates fast, lets you control your data, and is frequently more flexible than roaming — especially outside the eu, across multiple countries, or for heavy social. the exact price depends on your plan and usage, so size the data first and check current plans in the z&z esim shop.
why this matters
unexpected roaming costs and running out of data are the classic travel-data mistakes; choosing the right approach up front avoids both.
fashion trend on the ground
style trips are content-heavy and multi-city (think london-paris-milan), so the connectivity model matters more than for a quiet beach week.
travel situation
roaming uses your home plan abroad and can be simple but pricey outside the eu; an esim is a separate data plan you size to the trip. on a dual-sim phone you can keep your number active for calls/sms and run data on the esim.
esim & data volume
for a single eu trip with enough eu data, roaming may be fine; for non-eu destinations, multi-country routes, extra data, or a separate content plan, an esim is usually simpler. most travel esims are data-only.
recommendation
compare your home roaming terms against an esim sized to your real usage and validity. browse current plans and validity in the z&z esim shop.