It is always better to get the translation job done by a native translator of the living in the same country or in any part of the world but must have lived and educated in the country where the language is spoken, The native translator always brings the natural vocabulary while translating the document may it be technical, legal or medical. The pricing depends on the living cost of a translator in that country and also the kind of professionalism involve doing the job for an example a French translator living in Paris will be expensive as the cost of living in France is higher that the cost of living in Senegal where French is major language.
When you are selecting a translator for a particular language for particular country then it better to find out in which countries the language is spoken like French , Spanish and German are spoken in many developing countries and the translation cost is very low in these courtiers compare to European countries so it is always advisable to find a translator or agency who live or work in any of the developing countries but keep in mind the trouble of connectivity as well as if there is any political unrest they may cause the delay in deliveries.
The translator of any language should posses a very good English language knowledge as most of the time the intermediary language is English. It is also good to see that the translator is living in country where English is second language.
You may also be surprised to see that the cost of translation for African language is higher than the cost of European language even though Africa is developing or under develop countries the reason is very clear as talent pool of educated are less and many educated youth have not opted translation as their profession so the availability of translator in African language is less and the cost of translation is higher.
India provides a best destination for most the translation activity as running a translation agency in India is very low and project manager are available at very low cost even though most of Indian translation agency higher European translator for European language, The still are cheaper compare to European translation agencies.