Welcome!
in all honesty, it depends on what you are looking for and can afford.
Veileds are cheaper, but they all have relatively the same coloring.
Panthers, though much more expensive, have a multitude of colors.
Veileds have been known to be grumpy. Panthers can be, but some are very sweet.
What kind of cage are you setting up, Size, type.. etc?
What plans are you making?
What are you going to put in the cage? like plant wise and stuff?
Veiled and panther care are essentially the same. SO it really depends on what you feel comfortable spending.