Hi Patrick,
I would get the family together and look at some pictures to decide which theme appeals to you all the most. Royal pacific will be the least expensive with Hard Rock next and Portofino above that. Each HRH and RPR have one pool (RPR no slide) and they each have hot tubs. Portofino has 3 pools and 3 hot tubs. I find HRH's restaurant choices lacking but its easy enough to eat elsewhere. Both Portofino and Royal Pacific have some terrific places to dine!
It's an easy walk from HRH and RPR to the parks and with Portofino you may opt for the water taxi (offered at all 3).
The rooms in the least category are largest at Portofino. Only HRH and Royal Pacific offer a Club Level at this time but that may change by the time you go if you desire that room type.
Honestly all 3 have their charms and service is terrific. Make sure you apply for a Loews First to get a few nice perks.
www.loewshotels.com
As far as getting the best rate there are a few different ways to do that. AP, Fan Club Card, Entertainment Book, AAA and also Loews offers promotions all their own.
They are still offering hotel express access!
Personally, I like Portofino best with Royal Pacific coming in a VERY close second. Actually I think I may like them equally just will switch back and forth for a change. HRH is cool but I just did not find it to be on the same level of service as the other 2.
Go
here to compare the 3.