The pictured sails appears to be a Hooter (or reacher).
The difference in spinnakers and Hooters is the spin has a full shoulder while the Hooter is relatively flat by comparison.
As for high or low aspect, I suppose some of the original Hooters may have been low aspect, but then they began to be more high aspect.
The transition in spinnakers has been from a very large, full, big shouldered sail to a much flatter, higher aspect sail.
So, it would appear the two are becoming much closer than their origins.
Two good points on the Hooter is that is very light air they can be used to sail upwind and still be able to point as high as boats without a Hooter and much faster.
It is far superior to even the flattest of spinnakers on reaches, and I believe they are as fast or faster sailing downwind.
I have arrived at a point where I believe the entry of the sail is more important than lots and lots of sail area. And a bill full entry might just be more drag.
The second point is the ability to furl.
There are those that knock the Hooter saying that when furled you have all that windage hanging from your mast to the bow sprit, but usually they roll up very tight and offer about the same or less windage than a Snuffer bag hanging out on the pole.
A good furler system is much, much faster to handle than standard spinnaker or Snuffer systems. After watching all the problems this past weekend that the F18HT's and F16HP's had with their snuffer systems, I am even more convinced.
The Hooter can be flying within on boat length or sooner after the A Mark and can be carried to within a boat length of the leeward mark before furling (I use a 1:2 furler line -- the small line on the furler drum comes aft to a turning block and then back to the a fixed spot below the furler drum. Then a larger, more comfortable- on-the-hands line is attached to the turning block and comes to the mainbeam. Now, for every foot of bigger, easier to use line you pull in, two foot of small line goes around the drum. This gives you really fast furling speed.)
As a history, most of the sailors have resisted the idea of the Hooter and have stuck with traditional spinnakers. I have had the fortune to be able to sail against these folks and have won a lot of events with the Hooter. Sure, I have not won them all, but have won my share. And those that I did not win I was very close with a lot of my Spinnaker-clad friends way behind me. And keep in mind, I am usually sailing against much younger, stronger sailors (I am 65 and hurt a lot).

Hope this disseration helps.
Rick