I will almost always recommend a double jointed bit over a single joint.. most (not all!) horses will prefer having a double joint than a single joint.
The difference will be in your horse's mouth conformation. But generally, in my experience, horses tend to like a double joint rather than a single joint.
A single joint acts on the tongue (crackerjack action), bars (sides of the mouth), and the palate (roof of the mouth). When you pick up a single joint bit, hold it by the middle on one finger - you will notice that the joint will protrude upwards.. when the reins are activated, this is the action it will have on the roof of the mouth.
A double jointed bit acts on the whole mouth. It has no crackerjack action, and uses tongue pressure as well as bar pressure when the reins are activated.
My Bucket analogy!!
Think of picking up a full bucket of water with various bits; the snaffle will pinch your hand on either side.
The french link/bean link/what have you will have a whole hand coverage, and will be much more comfortable.
Now.. what you have there is an oval link. The middle portion is round, not flat, and is very mild. The copper will encourage the horse to salivate and work the jaw.
The loose ring portion will not allow the horse to brace too much against the bit, which is a good thing. Very little lateral pressure. If the bit is even a little narrow, I recommend bit guards so the loose ring doesn't pinch the lips.
Overall, good bit choice :)