Both do work. Some people have problems using the liquid, others don't like the foam and I have had patients just give up on minoxidil because they just couldn't continue using one or the other. You can try both, and whichever you feel you can reliably use twice a day from now on will be the best one for you.
Thank you for the post and question. Yes, Minoxidil liquid works better than the foam version because most of the foam is attached/applied to the hair, versus being absorbed through the skin to the follicle. Hope this helps.