You may want to know 99% of translators are freelance translators. This means they are NOT dedicated to any single translation company. Instead they may work for multiple, even a dozen translation companies. There are a small number of in-house full-time translators in some huge enterprises, but they are too expensive for the rest. If a translation company says they have better (freelance) translators than any other companies, don't believe them!

So what on earth makes the difference?

Process, again. Different translation companies deliver different quality with the same translators because their processes are different. If you want superior quality for your translation project, we'd like to introduce a translation process that can ensure the highest quality standard, which is certainly a bit more expensive.