Dealers choice.
Orally it is just as effective, although the 1/2 life is different (9 hrs for oral, 24 hrs for IM). If you take it by mouth, just split the dose during the day. Pain isn't really an issue for me, as I sort of like that (am used to it). Bigger issue for me is a higher chance for an infection with injection of aqueous solutions compared to oils. Who needs that sh*t?