@Li**
, Sorry, it is totally your decision. Border-bounce for 30 days visa exempt entry and could be applied for 30 days tourism extension.
SETV is for 60 days of entry and is eligible for 30 days tourism extension.
Check with his university how long he needs to have on his stamp for the Non-ED procedure. Visa itself needs to be applied with minimum remaining days on the current stamp. There still may or may not be some additional procedures for getting approval.