Upscale/Slow Motion order

I got Video8 Clips (PAL 4:3 576i PAR: 16:15) that I already De-Interlaced (QTGMC + Bob) and converted to PAR 1:1 / Square Pixel, using Hybrid (Final resolution 720x540).
I need to Upscale to HD (1440x1080) and Slow motion them to x2 / x4.

Should I Upscale 1st then Slow Motion, or should I Slow Motion 1st, then Upscale?

Opinion?

Best quality: Upscale first then interpolate.
I’ve tried both ways.

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