[JasonB]

There are obviously advantages to both approaches.

But the biggest advantage of Scalextric, apart from the nostalgia and history, is being able to rearrange your layout, which might not be relevant if you've decided on a permanent track.

The advantages of a routed track are the smoothness (no bumping around over all those track joints and uneven sufaces), the freedom of design (you can have the lane width a little wider, and you can have much wider radius turns), and the continuity of power.

If you wanted to keep the magnets then you can use braid on a routed track, instead of copper tape. It's a little more work as it needs a recess, and it doesn't give you the same magnetic attraction as Scalextric track, but it's a good compromise and I think it's sturdier than copper tape.

It's great to be able to set up a permanent track, and I've always thought Suzuka was a good basis to make a cracking slot track, so I'm sure you'll have fun with whatever you choose.