Warlock has a perk for two grenades. Don't have to waste an armor slot for that... As for sniping IB is all you need. And shotguns are about as... Well nothing. They aren't really useful unless your in crucible.
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You cannot compare solar grenades to void grenades. You also cannot compare two grenades at all times from an armour perk to two grenades that require you to use one subclass (which happens to be the support class and least useful for solo play and DPS). Armour is seriously imbalanced between classes. Certain items for some classes have no counterpart for other classes, leaving the game markedly unbalanced overall. This is indisputable. The stats for all gear is freely available to compare. The classes are balanced, apart from armour.
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I'd say Sunsinger is best for pve. You can self res, block pathways and slow down enemies with a few solar grenades and buff yourself up with shields if your about to go down