What Cars to Use for Scalextric Birthday Parties

Hi everyone!

I've been researching a bit trying to figure out what cars would be best for running scalextric digital parties for kids aged around 5-12...
And so far, the only obvious thing to do, would be to use super resistant cars, my first question is:

Whats the strongest type of car suitable for kids birthday parties? (ie. there will be many many crashes

)

But, probably more importantly, I will need a car that is smooth to drive, but is still quite fast so the kids can enjoy the experience, not too fast though.
I have tried taking the magnets out of scalextric cars and trueing the tyres, making the grippier by using 3in1 oil on them, but it still seems tricky to drive...
The reason I think its better to have no magnets is because when going round a corner, it warns you if you are going to fast by sliding or snaping out, but doing this makes the cars slower, and in a way, easier to come off...

So at the moment, I am using magnets in the forward position which is the best option I can see at the moment, I have used 3in1 on some cars to even the laptimes out. This is going fairly well, but I was curious if anyone knew a better car to run that may be better overall. So my second question is:

Whats the best car or best way to make a car easy to drive for kids?

Thanks very much every one!