Best MicroSD.

Is the best microSD card the SanDisk or the PNY because I'm not sure.

Sandisk and Kingston tend to be the most recommended.

i have a kingston and a sandisk

The best ones are the Japanese made ones.

I agree with anandjones.I've had a Kingston 2 gig micro made in Japan for a while works great. Some reviews show these have the fastest load time.I gave it to my girlfriend for her DS through, I upgraded to a 4 Giger "A-data" brand.
I havn't heard of anyone else that has one but its not slow and it gets the job done plus I got it for $30 on new egg a while back. ;DI'm sure most work well this is just my opinion since I own these.