All Hot Wheels track sets are compatible with each other so if you’re starting someone out, look for a complete one with a lot of options, so they can add simpler track later on as they expand.
At least the Ultra Hots wheels don't look that outdated by comparison. Let me start by saying that neither of the collectibles in the new set were around when The Hot Ones debuted in the 1980s.
How are you coping with all the Hot Wheels news from Mattel? The Car Culture series has got more exciting collectibles up next!