Having operated both 407 & 350 here I can confidently say the 350B3+ will leave the 407 for dead slinging. Over 6,000' plus 30oC the 407 struggles to hover where the 350 will still sling almost half her weight. As for AOG Eurocopters support is far better than Bell at least in India. Given a choice I'd fly the 350 but does take a LOT more to get used too, reliable tractors thats what they are
As for PAX much more comfy & heaps of boot space compared the 407