What's the Difference Between the Helix and 8274-4?

Both of National's planetary grinders are 110 volt, use the same tooling, and even pair with the same vac... so what's the difference?
In this video, Dave Bigham, National's Director of Global Training, talks through the features both machines offer as well as what type of contractor or job those features are best for.
Helix: nationalequipmentdirect.com/p...
8274-4: nationalequipmentdirect.com/p...
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