I can't compare those two mics, but here's some general advice-
Personally, I find the sonic signature of the particular microphone has more influence on the overall sound and 'realism' of a binaural recording than small differences in mic placement make in, around, or even outside of the ear. I think the best thing you can do is try several different small omni directional microphones, listen to the recordings you make with them and decide what sounds best. Less ideally, listen to other's binaural recordings made with various mics and try to eliminate the other variables other than the microphones.. then let your ears and your wallet decide. Not surprisingly more expensive mics often sound better and 'more realistic'. Price is not always the greatest determinant though and the 'right' sound is quite personal. Sometimes what sounds wrong with a mic is what you notice and that too can be a personal thing.
I tend to hear what sounds 'right' or 'wrong' to me with different mics before hearing the smaller differences in mic placement (within reason - we're talking about mounting mics on your head not x/y vs. spaced omnis). I often find pseudo-binaural HRTF type recordings (that's a contraction of Head-Related-Transfer-Function, a fancy term for head baffled recordings without outer ears) with the microphones mounted in front of, or above the ears, more convincing than true in-ear binaural recordings, even when listening with in-ear monitors (meaning no pina at all). Not always, but that's just me. Try a few different mics and a bunch of different methods and see what sounds best to you.
Other than personal preference, a lot depends on what you are recording. The requirements for recording a morning sunrise in a quiet meadow are much different from recording a deafening metal show, although people record both binaurally. In general, more expensive mics buy the ability to record quiet things with less noise or the ability to record louder sounds without distortion, but the differences may not seem as large when comparing recordings made in less demanding circumstances of medium loud stuff.