the gut has unlimited absorbtion abilities, so the oral route of administration would be most effective.
you can only apply so much transdermal to the skin. it is why the old "tren" ph's (dienedione) were so much more potent/effective/noticable than the td steroid product, trenazone which contain topical dienolone.
you'll see results from either one, but if you have enough for a nice high dosed, long cycle, oral administration (or rectal if your into that) will be better at getting large amounts into the body for a more potent effect.