I have always used ivermectin (usually the generic version) on our minis. I do not rotate, other than in the spring and in the fall, I use the "new" ivermectin "gold" stuff. Supposedly, with ivermectin, there is no resistance. Some still believe you should rotate it with another dewormer, but I do not.
When I have purchased very wormy horses (has happened 2x), I have double dosed them with panacur / safe guard.
One dewormer that should never, ever be used on minis is Quest, which may also now come in generic or other named knock offs.
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