For the same $ he can get this or that. Hence, it's an alternative. You might want to check out a dictionary sometime.
And not everybody needs 16gb of space on their phone (which would be 2000+ songs, or 5 and a half DAYS of music PLUS 4400+ pictures at full resolution). I just went ahead, and assumed he or she would be smart enough to make up his/her own mind on whether size was more important than speed. And if he wants to spend 2.5 times as much for what is probably a dubious benefit (most users REALLY don't need that big of a card).
And how is paying more than 3 times for the same exact card with a different brand on it an alternative?
And in general, brand name is next to meaningless for flash memory cards. They are all designed the same, built the same, often in the very same factories. As far as the SanDisk, it's brand is nothing to brag about. They have a reputation for high failure rates, as evidenced by the 70% 5* rating versus the 88% on the transcend.
Anyways, a couple of months ago I bought that very same Transcend 8gb card over a 16gb class 2, and it's working well for me.