It's mostly a cost-vs-payoff thing.
All the missiles are a low AP, so all MEQs get their save regardless, and with how expensive the Razorwing is anyway...
Monoscythes being Str6, Ap5 mean they wound most targets you'll be shooting on a 2+ anyway (T4 or less), and MEQ / TEQ saves mean they'll likely save a significant amount of wounds anyway, and they also have some use against vehicles.
Necrotoxins wound on a 2+, but can't hurt vehicles at all and as stated above, it's only against T5+ it really helps.
With the Shatters they're better at wounding with the re-rolls, but again, still 2+ again most of the time, and slightly better agaisnt vehicles (though in 5th, the AP- worked against it.)
In 5th, I'd always take monoscythes on the Razorwing because of this, and frankly, probably the same in 6th.
On the Voidraven, It'll probably be Shatters, especially being that Ap- isn't a negative, and it's the same str against vehicles across the entire template.
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