Going from my own experience, i would say if you want to do Hifz go to Darul-Uloom.
I started Hifz about a year ago and have only done 3 para's. I believe this is because of school. I receive about 4 homework's per day (usually in for the next day) and various exams have taken up a few months. This has interrupted my Hifz and i really need to go over what i've already learnt in order not to forget it.
But if you are sure you have enough time to do Hifz properly (i would say spend at least 2 hours per day) whilst attending school/doing what ever you do, do it locally.
If you think you wouldn't have enough time do do Hifz properly i suggest going to Darul-Uloom for a couple of years.
Hope this helps, Uz
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