Between vasectomy (in men) and tubal ligation (in women), which one is preferred [as a means of contraception]?

Fatwa, posted 4.22.2010, from Iran, in:
Religious Authority: 
Makarem Shirazi
Fatwa Question or Essay Title: 
Between vasectomy (in men) and tubal ligation (in women), which one is preferred [as a means of contraception]?

In equal situations, it may be better that the man use contraception.

در صورتى كه بستن لوله هاى زن يا مرد اجازه داده شود حقّ تقدّم با كدام يكى است؟

در شرايط مساوى بعيد نيست مرد مقدّم باشد.