It will give your research much broader appeal. It will involve you in much more than financial details. It should keep your concentration focused more. That's always important with PhD work!
I think there is not a better topic for Ph.D. thesis in particular. It's you who build the interest your. For that, you have just to be sure that you have respect the basic rule necesary for the contruction of the study objet.
I think both topics appeal to me but it will depend on the area with the problem you wish to address in your research. However, 2 looks simple and straight forward.
Thanks @collen shoko. however let me know if any dimension you know in 2nd topic.. i am gonna conduct study on Corporate governance and country governance index impact on FPI inflow in south asia.