Well, considering that you need to take a dosage of about 50mg everyday, I would tend to say that the 10mg winny would be more costefeective. A little bit easier on your digestive system as well....
You didn't really think that you were just gonna take 2mg or 10mg per day did you??? If so, I would recommend you do a lot more reading on this site before you go taking anything. You have some studying to do.
I am not trying to make fun of you. I just think that knowing about what you are going to do to your body may be more beneficial if you it know in advance.
Just my opinion.