It's not just for reliability sake (although that's a good reason) to render to image seqs, but also versatily - you can render out separate layers and composite them in another app (like AE).
In one of my movies done in Poser, over 45 layers were separately rendered out and composited later (in Combustion) was able to use different blend modes, selective motion blur and effects easier this way.

I would render out image seqs no matter what 3D app I use, be it C4D, Maya, Poser, Vue, D|S or C7 for that reason.

I've had few problems rendering out small QTs on my Mac, but why push it when you're under a deadline!

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