Well, my vote definately goes for a loader w/pusher box, plus a pickup, and if possible a skidsteer w/pusher box too.
This year we started out with a shopping plaza on our list for the first time. Our equipment list includes 3 3/4ton pickups and a couple honda snowblowers for walks. There are 4 of us, sometimes 3 if my brother-in-law can't come out. Yes, it is possible to do such lots with pickups, but it's much less efficient. Also, as previously mentioned, the amount of snow on the ground to push can drastically affect the ability of pickups to do the job.
We've subsequently dropped the plaza as a customer. I hate doing that but economically we're better off for it. We'll more than make up for the loss in salting charges, and additional driveways/small lots we've since taken on. I told the property management company they'd also be better off going with a company using larger equipment. Well, I was wrong there. The new guys are doing a brutal job so far. They've obviously assigned a very low priority to the site since it sits unplowed while our entire list is virtually completed. I guess the on-site maintenance guy misses us now, since he's been relegated to sidewalk duty with a handshovel. I don't think the new guys have touched the sidewalks, or the loading docks. Ha, ha.
Anyhow enough rambling, so go with the bigger stuff for the bigger lots. Or, factor in that you'll be onsite for a LONG time, and you'll have to relocate piles later.