The trouble is, the national curriculum has totally messed up education for kids who learn through doing rather than sitting still and listening. Almost everything practical has disappeared: they even write about cooking rather than learning to cook, most of the time! 
'Activist learners' are left with very little that suits them, and many come out of school feeling like failures. Bright activist learners fare even worse, since the very few practical bits that are on offer are aimed at young people who are not bright.
Apprenticeships are bringing back a practical option for some young people. This national website lets you search by postcode as well as/instead of by trade: www.apprenticeships.org.uk/ .
Level 3 BTECs are also a good option for activist learners/practical young people who think they might want to go to university. My son has just started one after a year pissing about doing nothing on a course that didn't suit him, and is (happily) re-engaged and motivated him after about 3-4 years of being disengaged and unmotivated. :)
Frankly (and speaking as someone who spent 20 years in education and another 7 teaching in FE and HE!) NO qualifications matter after they have gained you access to the next ones: GCSEs don't matter after you get onto A levels or a BTEC; A levels and BTEC don't matter after you get onto a degree course. And after a few years in work, your degree probably won't matter either.
But 'climbing the educational ladder' does matter, because the higher your personal qualification level, the more you are likely to be paid, and (more importantly IMO) the more choice you'll have about the sort of work you want to do. And choice is a wonderful thing: if you end up doing work you want to do, you'll live a happier, healthier life :)
Personally, I think the important thing is for your DS to find something that engages him. I don't think it matters what that is. It's disengagement and ennui that do terrible things to people's confidence, mental health and employability...