Capital One Venture X is undoubtedly the best value for a premium card. I've had the Chase Sapphire Reserve and Amex Platinum in the past, but they never made it to year two because without a signup bonus they're way too expensive. Venture X is basically free if you remember to book one flight/hotel through their portal.
If you travel at all the points are well worth it.
I just managed to fly both my wife and I to Thailand in business class with a stopover in Tokyo for 92,500 venture points each (points transferred to air Canada). We also have a southwest companion pass which is by far the best deal for domestic travel.
To the OP, the best site for general credit card info is doctorofcredit.com because the guy who runs the site is actually focused on the value to users and doesn't just shill whatever cards have the biggest kickback (the points guy is a complete sellout). This page is the gold standard when comparing signup bonuses.
View all of the best credit card sign up bonuses. We list all of the best bonuses, unlike other sites that only list cards that pay them a commission!
www.doctorofcredit.com