Sorry, Samsung and Intel are the leaders in storage. If you have had to deal with as many SDCards as I have in a corporate/enterprise environment you would know Sandisk is cheap crap. That's why they are cheaper, you get what you pay for.
Well, yes I understand that they are not the best in general, But in my opinion, they are the best. Tho, I don't really use them for much else, other than a small space to save the stuff I don't need, and for hacking :v