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My advice is to leave both turned off, otherwise it can cost you a fortune.
Wait until you have access to public wifi before you check your emails etc.
Hey @Jeff77 - If you have a Travel Pack and want to access the Internet, leave Data Roaming on.
However as @Davelew mentioned, this does come at a cost once you've exceeded your Travel Pack usage.
I'd recommend keeping it off unless you need to use to to check emails, use maps etc etc.
You'll be notified with usage alerts when you're about to exceed your data, after that turn data roaming off completely and rely on WiFi.