[vsjhoc]

I have both cards. But what is 'best' depends on what you want.

Cashback rewards - Chase is better because AmEx Blue gives points, not cash. But AmEx Blue Cash is a different card which does give cashback.

Interest rate - you'd have to compare these if you don't pay your bills in full. But if you don't pay your bills in full each month, it makes no sense to get a rewards card because the interest rates are higher than those on non-rewards cards and you wipe out any gain you get from the 'reward.'

A note of caution: Chase has a "Chase Freedom Signature" card. This has no pre-set spending limit (like the AmEx green card). However, if you have this card it can wreak havoc with your credit score because your credit limit is not reported to the credit bureaus. The non-Signature version offers the same benefits.