These three pens are not to be used for writing as they all all for writing on photographs or for labeling boxes. I taped them together so you could see the brand names and learn the difference in purpose.
The Sharpie is NOT (I repeat NOT) for labeling photos. It is good for writing on the box and for using on the outside of envelopes. It is permanent.
The other two have archival ink. I recommend the Zig pen because my friend Maureen Taylor says it is the best.
The other one I have had for a while having bought it at a trade show.