Hi Extro24,
I've not yet tried with either of them, but would recommend looking to see if any of the forks of those projects on GitHub have additional optimizations or security enhancements and show continuing development.
The last commit on the master branches of peatio and buttercoin were from October 2015 and August 2014, respectively.
Looks like there are more PRs to peatio than there are to buttercoin for what its worth.
Best Regards,
-Chicago