Microsoft is a six-barrelled shotgun to Apple's sniper rifle. Chances are, Microsoft will hit something. Whereas Apple's recent misses are so few as to be individually noteworthy.
Sure, I don't mean to commend them on their efficiency ('bloated'), but they have a startlingly wide offering of software. It's not limited to just Office and Windows de jure.
I don't really think it's fair to compare the R&D budgets - there's a lot of difference - MS has an extremely broad array of software (multiplied by i18n), while Apple has an extremely vertical stack of products. I don't think these differences can be hand-waved as being theoretically financially equivalent.
