None of them are just some cosmetic topsheet damage that you probably want to get epoxy on them just to prevent any further damage, the second one you dont even need to bother about being harmful to your ski
i think you should epoxy the second one for sure, the edge looks like its starting to delam, hard to tell from the pics, if so get some 24 hour epoxy and clamp it and epoxy the chunk out of the cap. and yes, epoxy for top sheets p-tex for bases, unless you have a gnarly core shot in the base,but thats a whole nother story. i would p-tex the third because it is right on the edge. keep your skis in good as shape as possible they last longer, and its fun to work on them.
i have had good experience with 3M epoxies for things like this. just make sure you get something that is waterproof and if it is 2 part epoxy, make sure you get the ratios right (it will say on the package), otherwise it will either never dry or will harden up to quikly and become brittle. I think p tex is general pretty generic, but i may be wrong. When you are doing the p tex make sure you heat the area you are repairing up so it is hot to the touch but not too hot (if its too hot you will bubble your bases and that is very bad), you can use either a heat gun (in my experience this is the best) waxing iron, or a blow drier (on the warmest setting)