Sony MW1 or the SBH52. Which one is worth buying?

Hi everyone
Hope now my query comes through correctly (Posted it in the correct section this time :)) and is of help to others as well.
Well, for the last couple of months I have been trying to figure out which bluetooth headset from Sony (SBH52 AND MW1) is better over the other in terms of-
1)Sound ie, after reading a lot I have known that the MW1 packs a Wolfson Dac but just could not figure out if it's the same or better on the SBH52?
2)Are the live Sound ear buds MH1A on the MW1 any better than the Mh755 in terms of the audio quality?
Is it possible that the Mh755 have been improved over the years?
This is because the whole SBH52 family of headsets have them instead of the live Sound ear buds.
3)And lastly the SBH52 being newer in comparison to the MW1 have any technical advantage in terms of the usability over the MW1.
And has anyone tried to couple the live Sound ear buds with the SBH52 and experienced the overall improvement or degradation in the sound?
Because I have the live Sound ear buds and would like to buy the SBH52 and use it with them.
I know a lot to ask but it'll really be a great help if you can help.
Thanks