The MX Team is a superb bike. It is much lighter than the XC or Dirt. It may not be as light as an Islabike though, but it looks much better than 24″ wheel Islabikes and that matters for kids.
My 11 year old son has had the Team for about two years. The 1×10 Deore gears are superb, he can get up just about anything, and can climb better than me in the Alps!
Personally I would choose the Team over the XC. The suspension forks will add a lot of weight and I don’t think the drivetrain is the same quality. My son spent two weeks downhilling in the Alps quite happily this summer on his Team. We have just bought a Dirt because we couldn’t find a Team and even after changing the drivetrain and brakes it is still significantly heavier – steel fork.
Only downside to the Orbea is the brakes are sh**t. My son crashed twice in the wet his first ride, on the Dalbeattie Red. When I checked I found I could actually flex the levers. I fitted Deore V brakes and he hasn’t looked back since.
I now know that you can buy the Team from Germany at a very reasonable price.