Of the ones I tested I found the best ones had rows of 3 or 4 dots and a kind of lip or cup for the dipped beam end (farthest from the base).
These lines of 3/4 LEDs best simulate the filaments in a halogen bulb and so most closely replicate their pattern in a conventional headlight.
This gives a good clean flat cut off and makes it less likely that you will dazzle other road users.
Certainly I never get "flashed" by oncoming cars when I am on dipped beam.
Once you have fitted the LED you will probably need to adjust the headlight as their "filament" positioning is not always perfect.
I had to adjust mine down substantially but compared to the halogen it replaced,...well lets just say I'm not going back.