If you're talking about a card at that level, it is really just the Amex Platinum and the CSR.
Both have similar fees. The overall opportunity for statement credits is better with the Platinum, with $200 in travel fee credits, $200 in Uber credits, and $100 in Saks credits. CSR has the $300 in travel fee credits, which is easy to earn as it applies to pretty much anything travel-related.
As Exterous covered, Platinum has better lounge access. Priority Pass is great in a lot of places, both for the lounge access and restaurant credits. But some places (like DTW) don't have any Priority Pass coverage, which is where the additional Centurion and Sky Club access comes in handy.
Both cards have a lot of options to transfer points. One difference is that you can redeem Chase points for 1.5x on their portal with the CSR. This has been a big value to me as someone who is booking in economy, where you don't find as good of value as those that are redeeming business or first class flights. You can book almost any flight that you can find (some of the budget airlines aren't covered) and still get 1.5x value -- i.e., 20,000 points for $300 dollars. You still earn miles when you book this way too.
Personally, I think CSR has better ability to earn points. Platinum may come out ahead if you're booking significant amounts of travel on the card for business purposes (5x on flights and hotels). But for me, my goal is to turn my everyday spending into points so that I don't have to pay any more to travel. CSR gets 3x on travel and dining, and you can also leverage other Chase cards, such as the quarterly 5x Freedom bonuses, 2x gas on the Ink Cash, and 1.5x on everything with Freedom/Ink Unlimited.
CSR has a 50k point sign-up bonus and Amex Platinum will get you 60k, although you might be able to find targeted offers for 100k. Another big perk of the CSR for me was the ability to earn signup bonuses on other cards. The Ink business line can get you 180k points between three cards with only $95 in fees. Between me and my wife, we were able to earn almost 500k points between a CSR, CSP, and both opening up all of the Ink cards. That got us at least $7,500 in travel that we could easily redeem through the Chase portal, although we got a bit more value by transferring points.