> For a 3A DC motor, which one do you recommend, transistor or FET?

Either will work and depends on lots of other factors.  Without more
details, the bipolar solution is probably cheaper, and the FET solution
more efficient.

> And in your personal experience, what's the best way to drive the
> energy that coil store in the ton intervals, during the toff?

If you are using an H bridge of FETs with body diodes, then you don't have
to do anything more.  The energy in the motor inductor will be
automatically discharged back onto the power supply during the off phase.
Other schemes require diodes in the right places to ensure nothing gets
fried.


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