We don't know a lot about logfs, so you will really have to make
your own comparison. However our general impressions are as follows:
1. In our testing logfs file operations seem to be much slower,
see http://osl.sed.hu/wiki/ubifs/index.php/IOzone
2. logfs code base is much smaller i.e. UBIFS has 3-4 times as many
lines of code.
3. logfs does not seem to have bad-block handling.
4. logfs does not seem to have wear-leveling.
5. We are not certain how scalable logfs is.
We could be wrong about those things - don't flame us if we are.
Ask us about UBIFS, not logfs.
--