What differences are we talking between the two? Speed, slip, holeshot? Without actually being able to test both props out, it's very hard to say which one i would use if for some reason i had to ditch one of them.
I would go with which ever is best suited to the conditions, or the days activities, provided of course it is practical for you to own / carry more than one propellor.
For general all round use, standard propellors offer fairly good performance. That's just my opinion though, and it has been subject to debate before.
In the end it will come down to the extra grip of the 5 blade, loss in top speed, and reduced holeshot and grip in favour of a higher top speed with the 3 blade....
If you have time, and access to many different props, then it can be worthwhile experimenting. But if it's something that you need to sink money into to find out if it works or not, then i'd avoid it...