How do London Teamsport Docklands, Watford and Leatchworth Teamworks Tracks compare

My nephew is turning 12 in August and looking to take him for his first karking session and the short list has come down to two Teamsport tracks, the one at Watford and Docklands in London and the Teamroks karting track in Letechworth so wondering if anyone is familiar and tried them with the electic karts or possible LPG karts.

Is it a case of one is better for kart vs kart racing and overtaking and the other more lap times follow the leader withtou so many over taking opportunities, one faster than the other , etc, any pros and cons other stuff to do etc please to help pick one