There are approximately a bajillion ways to make this all work -
I think Bob was suggesting that an Arduino could connect to
the PC/Laptop via serial/USB and do the necessary bit twiddling
to control one or more servos. Also gives you the opportunity
to read some sensors and get some feedback.  Functionally
it's like the off-the-shelf controllers you're  looking at, but you
have control over the software and can make it do other things
as you see fit.

TLDR: More capabilities =3D=3D More work.

-Denny
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