since one tooth is discolored and already rct treated ,clinically i would suggest a porcelain /ceramic crown. the other central incisor ca also be rct treated and both the crowns can be aesthetically fabricated to close up the gap without being wide,this is the real art and science,personally i have done such cases with wonderful results .

for good esthetics including 4 teeth is a better option..be it veneer or crown crowing only front 2 wud compromise esthics..

I have seen your pictures. . In your case you can opt for crowns for your front two  teeth but its width will be abnormally wide if the lateral incisors ( the teeth besides your middle two teeth) the not cosmetically involved in the treatment protocol. There should be cosmetic enhancement of all your 4 front teeth ie. crowns on the middle two  teeth and veneering on the side teeth so that the middle crown don't look broad.