There isn't a dependable list of 'easiest' consulting offices for international Master's students.

Hiring and visa sponsorship depend on local rules, language requirements, headcount and the candidate's work authorization. Offices can change eligibility requirements from one cycle to another.

An office may have many international employees but still be unable to sponsor the particular role or visa route you need. Applying indiscriminately to countries is rarely productive.

Build a shortlist based on both work authorization and career fit. Use the information on office and work-authorisation considerations for international Master’s students to prepare questions for office recruiters about your specific nationality, degree, and intended position.

Local language requirements ruled out more offices for me than visa sponsorship did.

Anyone know if a firm would reconsider you for another office if work authorization falls through?

I found the government work permit guidance more useful than old forum threads for checking eligibility.