The Japanese and Korean berries are much better. I wouldn't buy them at whim without any thought. They're definitely a treat to indulge in.
Edit: One thing to bear in mind - the main characteristics of these Asian berries is sweetness. They're incredibly sweet, with a hint of tartness. I have not encountered this level of sweet in any North American berry, though I have once in the UK. The Korean berries are also slightly less sweet and slightly more tart than the Japanese ones.
If your preferred strawberry taste note is tart/sour, not sweet, then you might not like them. My wife's cousin prefers her berries tart, so she prefers the cheap berries you can find at any grocery over these Asian ones.