You'll probably get varied answers on this one...
The Fantasy Package could change my opinion. Have you figured out the value of the UPH that comes with this package?
Personally, as a solo traveler I'd take the Hotel Royal Plaza, for several reasons:
I don't care for the Allstar Resorts when I'm traveling alone. Too many kids, too noisy, too far a walk from the hotel to the parking lot and back.
The rooms at HRP, in my opinion, are bigger, and nicer.
The location of the Hotel Plaza Blvd. resorts is excellent if you're spending most of your time in either the Epcot area or DTD/PI, which I do.
I don't give a squat about resort transportation, because I always have a car and prefer to get myself around. With a DTD location, getting places is quick, and any time taken by traffic is equalized by the fact that as a solo, you're on your own time schedule. No waiting for others in your group gives you freedom to make up for any loss of time spent driving, which is minimal (I'd say miniscule) from a DTD hotel.
If I was with a group with children, I'd take the ASR. But as a solo traveler, the only pluses I see with ASR for you: It IS a really neatly themed complex; if you won't have a car (or will have one but would prefer provided transportation), the DTD transportation system isn't the greatest, but the ASR transportation is pretty good; and most important, what's the value of the whole package, conidering the included UPH?
I should add that I consider both areas, within the WDW property, to be extremely safe.
Pat