The initial release for 5.10 has some serious defects. I don't consider 5.10 old enough yet to be fully vetted. The reality of the Perl releases are that 5.8.8 hung around for a long time, so the majority of modules work with this version and have not been updated since. In addition, a lot of the non-Microsoft operating systems come with 5.8.8 or near, echoing my sentiments.
They come with 5.8.8 because they're slow and their software is generally outdated. 5.8.8 is very common because it was the newest stable release for a long time. It no longer is. Go with 5.10.1. There's many, many bug fixes in it that you WANT.