Veneer for dark front tooth

Since a veneer is a more conservative treatment for the tooth (I don't have to grind the tooth down very much), I will typically use a veneer in your case - as long as the tooth is otherwise intact, healthy, and has no other large restorations. To be honest, in cases like yours I will often veneer both front teeth with extremely conservative veneers (even no-prep veneers should the case allow), so that the two front teeth will be made out of the same material -- if I do only the one front tooth, I will have several try-in appointments so that I can tweak the porcelain until I get it as close a match as possible to the neighbor tooth.  If you choose to do just one, it costs the same as two due to the greater number of appointments needed to get it just right.