Would dental bonding or Invisalign help close my gap? (Photo)

I will not recommend bonding for space closure, because the space is big, front two teeth will look big and bulky after bonding.
Best option is space closure by orthodontic treatment [braces/aligners].
Midline spacing is common in high labial frenum cases, so frenectomy is a must once treatment is over, otherwise, space will reopen.

For a more predictable and natural results, in your case, I think it would be better to close the gap with orthodontic treatment (Invisalign), because if you were to close the gap by adding composite to your teeth, they would look very weird, out of proportion and the results won't be natural-looking results. Invisalign can move your teeth predictably and once you finish treatment, the only thing that you would need is to wear retainers so teeth cannot move back.

Depending on what other conditions are present (for example if you have a high frenum which is the band of tissue going from the top to bottom of your inner lip), you might need to have this removed before initiating Invisalign. Bonding would work very well also; however, be informed that it will change the shape and size of your teeth and it has to be done artistically so that it looks natural compared to the other adjacent and opposing teeth. Dental veneers are also an excellent option if you are a candidate which can be determined after an exam.Dr. Ajay Kashi