Large Amalgam Filling - Does it need a crown and best option for material? (photo)

My dentist wants to do a crown on an upper back molar. The opposing tooth is a PFM. I have one other crown that is a bruxir that's fell off once but was put back on and has been a good looking crown, I have read they do have some issues with them staying on. Would a gold crown be the best In this case. I am worried the bruxir will be hard on the PFM and I thought gold would wear the best on the PFM and last the longest. I would think it being out of sight gold would not be an issue

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