Grand Union Paddington Arm and Paddington Basin much better; onward section through Regent's Park and Camden Lock fascinating, with more of interest as it carries on through Islington.
I did the Regents Canal from Paddington to The River Lee (via Hertford Union) in 2019. My cousin had to moor overnight around Old Oak, he couldn't book a place in Paddington Basin. He had great difficulty picking us up from Paddington Basin the following morning. We then criused to end of the Hertford Union (River Lee). We got the last spot at the end of the Hertford Union .
IMO▸ the whole route was spoiled by the numerous residential boats mored up to 3 abreast. We were not able to stop for lunch at any of the offical mooring as they were occupied.