Use the Heathrow Express from Paddington for the quickest rail link; it’s non-stop and reliable

https://www.scribd.com/document/1074920514/Getting-to-Heathrow-from-Gatwick-Easiest-Inter-Airport-Transfers-178501

Use the Heathrow Express from Paddington for the quickest rail link; it’s non-stop and reliable, though ticket prices are higher than tube options.