How is a 3/4 veneer different from a regular veneer?

As a rule of thumb, if a porcelain veneer (or 3/4 crown even) is possible, it is a better option than a full crown.  Less tooth structure is removed which means a stronger tooth.  Crowns aren't BAD, but if I had a choice I would choose the most conservative approach that does not compromise the result. 

Matching color and shape to the other teeth is possible, but may take extra effort and skill by the dentist and lab.  Additional visits and fees may be required to achieve "perfect".

It is said one of the most challenging things we do in dentistry is to match a single front tooth. Your dentist and lab will need to take several extra steps to ensure it looks good, but the result can be fantastic. You want to ensure that the most conservative option is taken during the preparation of the veneer. A veneer is a thin facing over a surface. You can even have a 360 degree veneer, one that is kept in all enamel and very thin. I am sure that your dentist will prepare what needs to be done to the existing tooth and nothing more.

If you only have one chipped tooth then a veneer would be a good choice for treatment. A crown is too extensive for a chipped tooth..Keep your own tooth structure when possible. Veneers are conservative and the shade can be matched using a good lab and some tooth whitening home care...

Your broken tooth can likely be repaired with a Porcelain Veneer and YES - it is a more conservative approach and preserves tooth structure. The other teeth can be matched very closely, although it may require more effort and skill on the part of the dentist and will likely be a higher fee to match one tooth.