Hi Eeli,
Thyroid II is a good product and works well. In general, herbal tonics are milder acting. For people starting out, it's often good to start with ATDs and once levels are in range, switch to herbal meds, especially if you're being controlled with a low dose of ATDs. For someone on a low ATD dose, like 2.5 mg mmi or less, it would be better to just take either the ATD or the herbal tonic. At higher ATD doses, you'd want to cut the dose by 2.5--5 mg and add the herbal meds.
However, herbal meds haven't been well studied in pregnancy so if you're planning on becoming pregnant you might want to stick with the ATDs to stay consistent. Best, Elaine