My program said take "this" and I did. Now they've changed to Bariatric Fusion, since the old brand got rid of the calcium and iron in the chewable so that you'd have to buy them separately. I do take 4 day, which I was told I would have to do forever and that you can only absorb so much at a time, which is why 4 daily. I buy them on the Bariatric Fusion website, 6-12 months at a time, usually during a sale. So, I end up paying around $20 per bottle. My husband just had the sleeve and needs 2 per day so I'll be buying more often.
Ask your nutritionist or surgeon if they have a preferred brand AND WHY. If it seems like they have valid reasons, use what they tell you.