i think you should stick to olly, because ....
... olly gives you a better stringref than wdasm (sometimes wdasm did not list some strings.. olly did)
... olly is faster
... sometimes wdasm killed itself ( cos of some weird anti wdasm code )

this is why i do not use wdasm anymore ...
i tried ida a few weeks ago .. its nice (cos it can also handle different filetypes like linux executables, winpe, ....) but its not easy to work with it cos there are so damn much functions/options...