Mertesacker: Official Club captain, 32 years old, on his last year, been on a decline recently, but has plenty of experience to offer as well as some leadership skills
Gabriel: 26 years old, hasn't really proved to be a success yet, is very erratic on the pitch, very inconsistent, still can't speak the language and with the signing of Mustafi and the impressive early displays of young Rob Holding, his chances of being a starter are slim to none
If you had a choice between the two, who would you keep?