only difference is Portal redemption is 25% less on the CIP vs the CSR @50%
i carry both the CSR and gold card, i do find many places still not accepting amex so i have my CSR as the backup.
Also the 4x earning on MR is on US dining while the CSR dining works everywhere.
as for reddit, i dont think we have a questions thread. the threads over there arent always looked at by many of us, your best bet would be to ask questions here. If you have a question that cant be answered here, i think maybe
@SouthFayetteFan probably can reopen our Questions thread again.
its ymmv. we had someone in here that used the insurance and was never asked to prove business. but ive heard otherwise as well... could be a risk.