Hi Jonny and welcome to the forum. I can only really comment on Ultimate Racer 3.0 which I have recently started to use with a home made deadstrip acting as the sensor and connected to an old laptop, my 2 sons and I run at home on a 2 lane Scalextric Sport set up and by using Ultimate Racer it has added a whole new aspect to our racing, the ability to set up individual racers and show, and keep, stats for each driver and car is brilliant, also the ability to run tournaments using any number of racers and cars is another great feature. Best of all it's free
We used to use the Sport counter and used to get missed laps on certain cars but now with the deadstrip and Ultimate Racer we don't miss any
Good luck with whatever system you go for.
Paul