You're asking an unaswerable question, in my opinion. (1) Many buildings are prewired and can't handle any more wire, you've got to make do with what is there, or make rewiring part of the contract. You're not likely going to be the lowest bidder on the job, if you do.
(2) If the people who do the wiring know what they are doing, you can have very good results using either coax or CAT 5. If the people doing the wiring don't know what they are doing, they are likely going to make a mess out of either. Believe me, I have seen people making a horrible mess out of either. (3) You have not mentionned running fiber ???? (4) You have not mentionned doing a wireless distribution ???? I suggest you take a building distribution specialist group on to discuss this further. I have included a number of my friends of that persuasion in the distribution. Regards, Vic Boersma
