I've done pellets (from 1 every 3mo, 4 mo, 6 mo, 1 year, 1.5 years), shots 1x/mo and 2x/mo, orals (sublingual and ingested) and different types of progesterone cycling and every combination in between. Now I'm on a Estro-patch/shot 2x/mo regimen.
After all that...My fav for convenience was pellets. For safe dosages, my fav is my patch/shot combo I'm on now. Personally, I didn't see much of a difference between 1x/mp and 2x/mo shots, but 1x was much better from a convenience standpoint.
In the end... I think they're just different ways of skinning a cat. Go with what's most convenient, comfortable, and affordable to you.