in my opinion..
I just got both M3 Real and DSTT.
I choose DSTT.
Better load time, easy to use, price lower a bit.
and... the speed.
I run Castlevania - Dawn of sorrow Opening Movie.
with the same NDSL + microSD SDHC 4GB Kingston class 4 [Japan]
M3 Real result....
Extremely lag. like 1-2...