Never used the S1A3, but the Spectrum is a great device. It's very robust and the firmware get's better and better. It can be programmed using a PS4 remote or the integrated 8 way joystick and runs super smooth.
It's great for timelapse and live video. It features a live2timelapse option (using the PS4 remote), which means that you can record any move of the 4 axis and then play it back as a timelapse move (or live video, of course). Traditional 2 point timelapses are also possible. You can interface the Shark slider, the Dynamic Perception Stage One or even the Rhino EVO, all of which work great.
With the next firmware release, panoramic shooting is also enabled. It's not the cheapest option, but in my opinion worth every penny.
Hope this helps.
Best regards,
Matthias
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