If you already have a universal adapter, buying a country-specific one might sound redundant, but there are real tradeoffs between the two.
Universal Adapters: One Device, Every Country
A universal adapter covers most of the world’s plug types in a single device, which is ideal for multi-country trips. They tend to be bulkier than single-country adapters and, on cheaper models, less durable at the sliding-pin mechanism over repeated use.
Country-Specific Adapters: Compact and Simple
A single-country adapter is smaller, lighter, and generally more durable since there’s no moving parts to switch plug types. The obvious limitation is that it only works for that one plug standard, useless the moment you cross into a country with a different outlet type.
Which Should You Buy?
For a single-destination trip you take repeatedly (an annual visit to family abroad, for example), a country-specific adapter is smaller and simpler. For multi-country trips or infrequent travel to varying destinations, a universal adapter is worth the extra bulk.
Final Thoughts on universal vs country-specific adapter
If you travel to more than one or two countries a year, a quality universal adapter pays for itself over buying separate single-country adapters for each destination.