If you want to be in employment after becoming CA, do your Articleship in any of the Big 4 firms. Or else do in a medium size firm. Because in Big 4 firms, you will be delegated to only one area viz., audit or taxation or secreterial practice, etc. So it will not be beneficial for you if you want to be in practice after you become a CA. But if you want to be in employment, doing Articleship in a Big 4 Firm can fetch you better opportunities because of its brand name. Also remember that you will not get much time for the preparation of your exams if you join in a Big 4 firm.
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