I don't think you understand the these terms. aGPS uses assistance data to obtain a faster initial GPS fix. It's still GPS and most aGPS devices will fall back on standalone mode, if needed. For some reason, it's a very common mistaken assumption that aGPS is tower triangulation. It's not -- tower triangulation isn't GPS at all as it doesn't use the GPS satellites. A lot people seem to use "GPS" to mean any method of determining your location for some reason.
sGPS refers to antenna design. All it means is that the GPS antenna is shared.
It's not a matter of "aGPS versus sGPS" as they're apples and oranges.
Can you clarify exactly what it is that you're looking for?
Not by a long shot. Here are the specs for the original Droid
DROID by Motorola - Android phone - Tech Specs - Motorola Mobility, Inc. USA
As you can see, aGPS and sGPS are not mutually exclusive.