There are 10 properties but 1 is a Ritz, 7 are AC hotels and 2 are Renaissance.

Ritz is beyond my affordability
AC hotels from what I have read so far does not offer free breakfast hence I am lukewarm on them especially when entire family is traveling.
It leave me with 2 Ren properties.

From the description the Fira property sounds interesting but I have not seen any trip report or reviews from other members. The kids like tall hotels with good scenic views and has an amazing number of suites which I hope increases chances of an upgrade as a Platinum. Also, if I rent a car (not decided as yet) it is the only one that has a reasonable parking fee.

One more thing to consider is paying cash vs. points. Both are category 5 properties but I can daily rate for Fira property I am getting is 94 Euros but the downtown barcelona is around 157 Euros. Hence I was thinking of paying cash for Fira and pay with points for Barcelona depending on which one I choose.

Any help or pointers / criteria in making the decision would be greatly appreciated.

Lastly, even though it is a Marriott forum I do have the option of staying at Hiltons as well and so if anybody has a perspective on comparing the Renaissance properties with the 2 hilton that would be welcome as well.