Plz help me guys!

[minup_123]

Hi all
I have a question.I am right now on H4 Visa but want to pursue Phd(full time) so have to change visa to F1.assuming that i have an i-20 my question is
Which is the better option?
1.Going to India for stamping(r the chances of rejection more?)
2.Going to canada for stamping
3.Sending papers by post to the immigration service center(Texas)(which i heard wud take quite a lot of time)

any help wud be appreciated

Minu