I would say whichever is cheaper, keeping in mind that nothing is cheaper than free from the junque box. I used the floor sweepings (advertised as npn 300V and 10W) from Poly Paks, and none of these have failed yet. I did have one genuine Motorola MPSA92 fail after 40 years of service. Just make sure you are driving your transistors into saturation. Obviously TO92 is smaller than TO220, and this might be a factor in your application.
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