Stay away from Bally's, since the bad are really bad, and you just can't always guarantee what you'll get (well, unless you have a guarantee of a pre-block).

In non-summer (beach months), my #1 vote is Harrah's. Though, the Waterfront Tower is quite difficult to score on the weekend. The new suites in the Waterfront Tower are also very nice, a few details are HERE.

If you can go to the beach (i.e. warmer months) then I vote for Caesars, especially now that there isn't a bad room in the house.

I wrote about the new Caesars AC rooms in THIS THREAD.

I have a number of reasons for my preference of Harrah's Marina; which include their hugh indoor pool area that is absolutely tops --- as well as an awesome Red Door Spa. Also, the pool area is ADULTS ONLY, and has complete bar service; basically a win-win scenario, and never any kids splashing around.

My "favorite" AC casino for tables is Caesars. For VP, Slots and Tables, Showboat. My third choice is Harrah's, but I do like the Diamond Cove area, and the craps games are pretty active.

If staying @ Harrah's Marina, I'll usually just cab it over to the boardwalk, spend 6-10 hours, and then cab it back to Harrah's. A few times, I'll drive over, use the free valet, and then possibly cab it back if it's been a drinking evening --- retrieving my car in the morning from the boardwalk casino.

I have no patience, of recent, for the Harrah's shuttle --- but, it's not like I go back and forth 10 times a day.

Without a doubt, the Diamond Lounges at Caesars and Bally's are the best.
Harrah's lounge in too small, but, one of the bartenders Dino, is awesome.

ConciergeMike is correct,

Centurion is the newest tower @ Caesars, and offers the best views.

The older Ocean Tower also has good views (a bit shorter tower), and easier (but, not a hugh deal) access to the new Qua Spa, Fitness Center, and outdoor pool (which is not really applicable for a non-summer stay).

The Ocean Tower also has all of the butler suites, IIRC.

Since they no longer use the "Temple" designation for the web site booking, the categories are NOW as follows (well, at least from what I can make out from the descriptions) from most expensive ("best") to least expensive :

Premium - refers to the Centurion tower with a good view
Luxury - refers to the Centurion tower with a city or skyline view
Deluxe - refers to the Temple Tower

I'm "guessing" that they interchange Ocean Tower rooms also in the Premium/Luxury category, but the rooms depicted on the website booking are definitely the Premium and Luxury I describe in my pictures (in the Centurion tower).

Since all of the rooms have been renovated, getting stuck in the "Temple Tower" isn't a hugh deal, as it once was --- but, do be aware, the "Deluxe - Temple Tower" does have interior view rooms, that include a window overlooking the big Wheel of Fortune Slot Machine. ;

For historical purposes, the Temple Tower was the original Caesars hotel tower, that was previously a Howard Johnson's. In order to open Caesars Regency Boardwalk as the second casino in AC (after Resorts) there was a requirement that any casino hotel had 500+ (I think that was the #) hotel rooms in addition to the casino. Since they were in a rush to open Caesars, they grabbed the HoJo, and built the casino adjacent to it. Over the years, they have expanded the property around the original HoJo (Temple Tower) eventually enclosing it by the lobby; which is why they have "interior view" rooms.

Mary2e, another option, is a HOB (House of Blues Studio) @ Showboat. The "usual" player rate for a Saturday night will range from $250 to $350, YMMV. Some details HERE.

If staying at Showboat, the best regular rooms are in the "Bourbon Tower" with the higher floors giving the best (and most consistent) views.

If you are a TR member, there "might" be some tricks to score a better room rate, but those details would have to be by PM.