both locations are probably 'safe' - and both are held on the phone itself not the storage card so there's no issue there
of course, unless you are planning on releasing several games using the exact same version of the GD library, then all that's happening is that you are spreading your files around the phone, rather than keeping the installation in 1 place
certainly at the moment there is no concensus in the Smartphone community over such file locations - maybe this will come as the platform matures - we can only hope
