Chose single blade, because that's what I carry MOST of the time. My Navy Knife gets the most miles (worry free carry due to SS blade), but my #83 and Russlock get carried or used to quite a bit.
I also carry my #89 two blade, and just got a Case Sowbelly I'll be trying out, so I'm not against multiple blades.
I hate unnecessary bulk in my pockets, so I typically only carry one, but being an Eagle Scout, I do prepare myself for times when I may need something different. On Christmas I'll have my Navy knife for opening packages, clampacks, (also easy for others to use) - probably a second folder in case one gets commandeered, and my Leatherman for any assembly that may be needed.
To be honest though, anything is better than nothing.