It's horses for courses and everyone & their dog has a view... My 10 pence worth:
Take a step back and look outside the box. The scope of H&S in the workplace, in all the differing industries, is gigantic. The vast majority of Safety Practitioners I meet (and that's a lot) tend to stick to a specific industry / specialise within a specific industry. Although there is a large element of core safety skills required wherever you work, the question begs... why on earth would you want to put yourself through the ringer by studying everything under the sun... stuff you will never, ever, ever use! ..and to make matters worse, then have to answer questions on it in order to pass an exam!
I, and many, many others have little time for the NEBOSH route. Not only the pointless requirement of having to study such a wide and diverse amount of subject matter, but also the tone and language that comes with it... it does not fit in the workplace and is a hindrance to good communication, in my view.
The NVQ route forces you to do the disciplines required in order for you to fulfil your role in your workplace. Do that first, gain your experience, and then start looking at a wider field if that is what you desire... It is far better not only for you, the people you are supporting, and 'our' industry as a whole, for you to do this from a competent foundation as opposed to going in all guns blazing, armed with your NEBOSH Diploma.
Sadly, to progress through the IOSH ranks you'll eventually need to 'get on board' with the NEBOSH way of doing things as the open book exam is very much geared in this mould. Don't let that deter you or influence your decision though, I and many others went the NVQ route and succeeded without NEBOSH.
Depending on your experience and the level you are working at you can get through your NVQ in anything from 6 to 24 months... I did mine in 6 (but did an advanced diploma years before hand). It will depend on what evidence you have to hand of your activities, what you still need to learn, how dedicated you are, and how much time you can put aside to do the work.
Sorry Franky, can't agree with you, I would advocate that you gain experience and then get the qualifications.
Widodo, with you on that ?*?*?... I see far more adverts requiring NVQ4 or 5 than I do for NEBOSH Diplomas.
Final spin on this, an NVQ is recognised academically and can be directly scaled against other academic qualifications i.e. degrees.
All above = my opinion (but it's a good one!)