Well, lets see, for 4A, the Big Yo uses a O-ring response and is bigger than the Aquarius making it easier to catch. The Aquarius is smaller and uses a tight gap response.
For 1A, if you want to start Matador tricks, I would get the Black Knight because it has tiny dimples which allow you to grab the yoyo. If you want a indestructible, good and affordable yoyo that is fast, I would get the Speed Maker (Prefered if you like simple fast tricks). For a yoyo for more complex tricks, I would get the Dark Magic it spins long, and can play pretty fast if needed.
But, it all comes down in your preference.
I hope this helps!