In that case, assuming the frost action is taken care of (i.e. footing below frost, and friction piles long enough to negate the frost action) and assuming this is on some sort of clay and not bedrock.
Footing:
Pro: easy to construct, generally less concrete, can be excavated and backfilled with equipment already on site.
Cons: Subject to vertical movement, require lots of excavation (depending on frost depth), low capacity (depending on bearing material)
Friction Piles:
Pro: Negligible vertical movement, generally high capacity (depending on skin friction)
Cons: More concrete than footings, require specialized equipment to drill
There are more pros and cons for each but that's my quick version.
In the end, the biggest factor in which foundation type to choose is the soil characteristics. If you're in a 60 foot deep chunk of sloppy clay, then piles are a must, if bedrock is near the surface, then pads are a no brainer.
There's no perfect solution that will encompass all situations.
Based on your sizes, I like the drill because it's a one step pour. No joint, no forms, no backfill. Biggest con I see is potential availability of drill rig. But you wouldn't need something very big for this at all.
Much of it will depend on the quantity. If you only need 1 or 2 I'd probably go with the spread.
You could always detail both and let the contractors bid them based on which they prefer.
