Like others said before me, it is a matter of opion, but I personaly like the Microsizers better they worth the extra booty. Here is a list of pros and cons. Sorry I could not put them side by side but there was not enough room.
Zips
Price $10 to $20 less
Speed Exceptable, if not racing most bits
Turning Unexceptable 4 racing small courses
Body perportion Real 1/64 scale
Body Paint Slightly spoted
Body Headlights Not tranlucent
Mod guides Not many yet
Models avaible Less than 10, but spongebob is coming
2 Speed engine Nope
Clone Clone off BitCharG
Frequencies__ 2 available
Battery life 15 minutes with default and 1.6
Bitcharg
Price More expensive
Speed Much better
Turning Much better
Body perportion Fake, acutualy 1/70 scale
Body Paint True color
Body Headlights Clear and ready for Led installation
Moding guides Many
Models avaible More and many more coming
2 Speed engine Only in select models
Clone Real thing
Frequencies__ 10 including the a IR mod
Battery life 8 minutes with default and 2.2