Snort = Quick (1-2 mins) onset, quicker comedown & permanently fucked up epitheal tissue.
Oral = Not as quick (20-30 mins) onset, lasts a lot longer & undamaged epitheal tissue.
Besides if you don't ever use adderalls and you have 30mg tabs, then either way you're going to be speeding and pretty fucked up as 30mg is a descent dose.