This all depends on what type of riding he wants to do and how much he wants to spend?

There's a couple of differences in what makes a wheel strong.

1) If it's Single, Double, or Tripled walled. The more walls the stronger but also the more heavy they are. Sounds like he's probably got a single and needs a good double. Triple walls aren't as common anymore due to modern doubles being just as strong but lighter.

2) How many spokes. Wheels used to come either 36 or 48 spoke, and again the 48's were stronger but heavier. But 48 spoke wheels are obsolete and a thing of the past now days too.

So if it's freestyle park Cinema is one of the more expensive brands that I like, but I'm sure cheaper brands are probably just as good.