Not sure what you mean by BIS miles with Delta?
Delta Amex give you Delta sky miles and its Status is Medallion and is a two part qualification based on flight dollars(MQD) and flight miles(MQM). Easy to reach MQD spending but hard to reach the minimum 25,000 MQM qualification on flying a few times a year. With the Delta Amex Platinum, you get a MQD waiver when you charge over $25k in a calendar year plus a 10,000 MQM bonus(plus another 10,000 MQM if you spend a total of $50,000) in the calendar year. So, if you don't fly that much but you can charge $50K in a year, you will reach silver status (at 25,000 MQM) every other year. While it is nice to be a Silver Medallion Flyer, you are low on the upgrade list so the perk is not all that great. Still, the companion ticket on Delta Amex Platinum can be valued well above the $200 in travel credit (especially during holiday and peak travel times). You do give up free lounge access for a $29 fee though, and no uber credit.
You can upgrade to the Delta Amex Reserve card at $495 annual fee which will give you a first class companion ticket plus the free lounge access. However, the spending levels changes to 15,000 Bonus MQM for $30K (Plus another 15,000 MQM for spending $60K annually). If you primarily fly on Delta and can spend $60K annually, this would be a good option to check into if you can reach the Gold Medallion Status at 50K MQM's.