Which vehicle and which part?
I had a bunch of small stuff rechromed by Paul's Chrome near Pittsburgh, PA. Outstanding quality, but with a price to match. Good quality rechroming is labor intensive and the disposal of the waste is expensive.
My first choice would be a NOS original if you can find it. Failing that, as others have mentioned, it all depends on the part. Some repros are Ok, others are dodgy.
What have you got?