That's a great question. Perhaps you should download Simulationcraft and figure it out for us.
How dependent is deep destro on raid buffs? My guild has cleared Ulduar 10 (we primarily consider ourselves a "hardcore 10 man guild") but has picked up recruitment to work on 25 mans. The problem is, none of our shaman are elemental. Only 2 of our druids are boomkin but one usually has to go resto and the other is often asked to MT on his DK. Caster buffs are non-existent in 10 mans and severely lacking in 25s so I'm wondering if destro suffers more from the lack of crits buffs compared to aff/felguard?