Which 1-D denoise method to use?

There are so many methods can be used to denoise a 1D signal. How to I know which method is suitable for me? For example:'cmddenoise','ddencmp', 'wdencmp'.

I am currently analysing the signal with 1D discrete wavelet transform with 'db2' up to level-3 decomposition and matlab choose cmddenoise with sigden = cmddenoise(sig,wname,level) in wavelet toolbox for me. How is that better than the others?