If you are using it as a field guide, I think the Myers guide to Borneo is superior simply on account of its much better illustrations. I also like the layout and method for describing vocalisations.
As PapuanBirder notes, Philips is a more comprehensive book, but I question the benefit of including extraneous information such as site information in a field guide. Most birders will use up-to-date trip reports for this sort of information, making it redundant in a field guide.
I will also say that the proof-reader for the Myers guide should find an alternative career: I literally lost count of the number of errors, and I wasn't intentionally looking for them. Mostly they are trivial typos, but there are also more serious errors such as duplicated text used for two species, and even duplicated illustrations.