I130 + I485 concurrently will be faster, but it involves travel (either you or parents) for anything that needs physical appearance.
So your alternative will be you file I-130 at your address and get receipt, they file I-485 based on the receipt at their address, and parents will get I-485 processing in their local office. Up to you.
So your alternative will be you file I-130 at your address and get receipt, they file I-485 based on the receipt at their address, and parents will get I-485 processing in their local office. Up to you.