I will answer what sayyidna umar b khattab said about this issue
"someone better than me ( abu bakr) choose a successor and someone better than him ( Rasoolallah) did not.So thats why I will not choose a successor".
AT any rate give me a leader that enforces shariah in all spheres of life ( not selectively like mr zia and his disastrous foreign policy of backing afghan bandits) and I will be happy no matter how he gets into power
About the saying of the Umar- what a foresight Abu Bakr was blessed with that he felt the importance of nominating a successor whereas the Prophet of Allah didnot! And, to this day there remains confusion and division about this issue. Full marks to the first caliph.
The seconed part of your post is amusingly vague.