e) Membership Rewards transfer instantly to many partners including AC, BA, DL, VS. Starwood transfers typically take a week or longer. This means MR points can be transferred during the process of booking award flights, no risk of orphaned miles.
I have lately come to appreciate this a lot. If you are someone for whom DL might be a good fit Amex can be really good. You can set up a reservation over the phone keep it on on a 1 day hold and then transfer the points in and ticket it online without paying the customer service fee. You save $25 and you do not invest in dreadful DL.
This ssomething I like with Chase Sapphire as well. Wish they would get more partners. I am still so bitter over the loss of CO as a transfer partner for Amex. Seriously devalued that program.