No difference
If you don't like the injections go with transdermal. For me I needed to do 100 mg. twice a day. That's ten pellets twice daily. Also you need to dissolve the crushed pellets in acetone then add the DSMO and rub it into your shaved, exfoliated forearms. Rub until there is no oily residue. By the way the tren CANNOT convert to estrogen. Tren is highly androgenic. I guarantee you will get frequent and prolonged erections. You will feel great. Stay on longer than a month and you will feel like shit for a month after you quit. Stay on too long and you'll lose more of your gains. If you are prone to hair loss you will lose hair. Half will come back after three or so months, the rest is gone for good.
I've done it both ways and the injections are actually cheaper and more convenient. I only rotated between my right thigh and right glut. No problem.