Hi, what crown

Hi, what crown type is advisable for single back molar, for someone who clenches at night and does not want all metal. One dentist has advised Emax Ceram Ivoclar half crown, and a second said PFM is a better option. However, after doing some research I feel that a BruxZir all zirconia would be the better option. Can anyone please comment on this, and also advise what the benefit of having a half crown to a full crown would be? Many thanks