Source 

Pakistani former wicket keeper Rashid Latif believes Sarfaraz Ahmed should've been named the vice-captain instead of Mohammad Rizwan for the upcoming Test series against Sri Lanka

I agree with this statement beacause in last few series Muhammad Rizwan got a lot of chance in the test matches but he was not perform well even in last series against England team Muhammad Rizwan performance was zero therefore PCB was given chance to sarfraz Ahmad and he was performed wonderful which helps Pakistani team to give leads but not in the winning case

At this time I don't think that Pakistani team is strong team in the test format they lose wicket early because in the test cricket you know that experience is working but in the Pakistani test squad all are the youngsters players which doesn't have any experience just except sarfraz Ahmad

Vice captain 

If we talk about the voice captain that's in the test cricket Muhammad Rizwan is voice captain instead of shadab khan beacause shadab khan doesn't play test cricket according to Rashid Latif that they choose sarfraz Ahmad as a voice captain beacause he has experience of capitancey and he is a suitable for This post but I think Babar Azam will not accept it beacause both are closed with eachother maybe they will give chance to sarfraz Ahmad if they will give chance to sarfraz Ahmad as a voice captain then his chances of playing will be increased in the ODI format maybe he will be select for the ODI world cup and Asia Cup but mostly chance's is that Babar Azam will tries to just play him in the test format

Sarfraz Ahmad as a captain 

If we see sarfraz Ahmad as a captain then under his captaincey Pakistani team was win champions trophy against India team that's was amazing and in this match all the Pakistani players was performed good Sarfraz Ahmad winning percentage is wonderful as compared to the all Pakistani captain hope that he will select as a voice captain maybe he will select for the ODi international squad beacause this will be suitable for him