The UPH will always be more expensive than the 5 day PH or PHP, but I imagine your real question is on value, which depends upon what you want to do while you're there. If, for instance, you want to do days where you go to water parks AND theme parks, this makes the UPH more attractive. If you want to go to DisneyQuest, this makes the UPH more attractive. According to allearsnet.com, an advanced purchase 7D/6N UPH is $347.19 for adults and $277.97 for kids while the 5 day PH is $231.11/$183.18 and the 5 day PHP is $263.07/209.87.
So, what you need to do is figure out the value to you of the options you get on UPH that you don't get on PHP. IMO, these are:
* Unlimited vs. Finite or No "Plusses"
* DisneyQuest is part of UPH but not PHP
* UPH has ultimate flexibility (i.e. you do not feel you are "wasting" a day by going to a theme park for only a couple hours on one of the days)
Of course, one advantage to the PH and PHP is that unused days never expire whereas the UPH is only good for that fixed period. Also note that you have to be staying on-site to purchase a UPH.