The main difference will be in the pressing, with English manufacturers putting more care and attention into their pressing and asian manufacturers less so and just going by a standard for each bat. Although asian bats are a bit of a lottery, you will get the odd one pressed perfectly, and some not so. The problem being with a lot of asian bats having poor toes due to the pressing.
Handles on asian bats can be poor too, with asian bats sometimes using cheaper quality handles.
I prefer English bats for this reason and will continue to support English based companies. Afterall, it all supports our economy!! Although I wouldnt mind trying an SS in the future as they seem very popular with this forum and i'm sure they churn out some mean bats.