Powder over pills for o/s orders as pills are more easily detected via scanners etc, powder may be more easily detected by canine detection due to quantity of the active ingredient (e.g. MDMA) i.e. if you are ordering a gram which would essentially constitute approximately 10 pills worth, however this can be overcome with multiple vac sealing (minimum twice) and careful preparation (clean environment, wiping the vac seal with alcohol between seals etc. If you are ordering domestically it shouldn't make any difference provided the packaging is done correctly i.e. the pills cannot be easily felt through the package. Hope that helps, very nice to read a noob doing their homework before jumping in, +1 for you