First off, Looping yo-yo’s are smaller and has a very tight gap with a very responsive system that allows you to shoot it out and fling it out again as it comes back.
String Trick yo-yo’s are big and have wide gaps for you to land the yo-yo on the string and they spin very long and are hard to pull up unless you know how.
If you are a string trick type of person then go with the Velocity. With the adjustable Starburst you can set it to where how easily the yo-yo can come up when you pull it. The DM is also a good beginners yo-yo and will grow with you.(#1 Choice by the guy who designed it).
A good looping yo-yo will be the Sunset Trajectory or the Loop 720, or Speed Beetle… If you don’t take yo-yo as seriously as most of us then I say get a Imperial.
Really it depends on what kind of person you are. The Duncan company claims the SB is fast and if you like fast then get that. The ST is a good because it is a Looping version of the Journey.
I say the 720 sounds good because it’s response system is string and it takes a lot of practice to master one-two handed looping.