Articleship transfer within big four

Sir, i reside in Vadodara.I cleared my group 1 in November.I wish to go for Articleship in Big four.I have an alive option for Vadodara Deloitte but they have only Auditing department here which may limit my learning.PWC and EY asks for both group still would require reference.Shall I join Deloitte now and later transfer to EY/PWC or shall I wait to clear my Group 2 then try for EY/PWC ?Will such transfer be possible ?