In V-Ray, which lights do we have to use in indoor scenes? Are standard lights better than v-ray for an indoor scene?

No , The V Ray Light of course is better than the standard but try to use the V ray materials and cameras to give you a better quality in your indoor scene or outdoor .
Try also to use the V Ray daylight .
this will give you a better Quality .

I think you have to go for v ray light, u will get better quality and close to real shot