If you are choosing between a wig and faux hair: faux hair for anything outdoors or all day. Wigs get hot, shift when you dance, and are the thing people end up carrying by hour six. Braids do not move once they are in.
If you want it to show up on camera: go tinsel. Plain color reads flat in daylight photos. The reflective strands are what catch stage lights and flash, which is the difference between a look and a photo of a look.
If your hair is dark: pastels need more strands than you think. Light colors sink into dark hair from a distance. Either commit to a full section or pick a saturated color instead of a soft one.
On putting them in: braid into a section, do not try to hide the join. These are meant to read as added hair. Pinning them under your own hair is how they slip out.
If you want the whole look to hang together: pick the hair last. Choose the outfit, then the headpiece, then the hair color that lets both of them win. Hair chosen first is what ends up clashing.