MontyB
All-Blacks Supporter
There's two ways of looking at this.
1) You believe that Moscow must be captured as quickly as possible as it would achieve several important goals. It would sever Soviet communications north to south, it would mean capture of a vital railroad hub and supply centre and it would be a huge morale blow to the Soviets, possibly even causing a general internal collapse. The war would be as good as over.
2) You believe that Moscow, whilst important, would not have a decisive impact on the course of the war as by the time you occupy it all the political and industrial apparatus has already shifted eastwards. The capture of the capital would not cripple Soviet communications and would only serve to stiffen resistance. The war would continue regardless.
The important questions are:
1) Which one of the above scenarios do you believe?
2) Is the German Army strong enough to capture Moscow even if Kiev is left alone?
3) Is the German Army strong enough hold Moscow against the expected Red Army winter counter-offensive?
4) Can the right flank of Army Group Centre be properly protected against the Soviet armies forming near Kiev while Moscow is taken?
If your answer to questions 2, 3 and 4 is no then Kiev is obviously the best choice, so long as Moscow is left to 1942.
This is also one of the reasons I think switching the thrust south was "probably" the best move:
1) They had an opportunity to destroy an entire front, 6 Soviet Armies, something that very few nations could have replaced rapidly enough not to have caused a total collapse of the southern front.
2) Leaving a huge southern salient while driving on Moscow would have left a very over stretched front line especially when you consider a large proportion of Army Group North was tied up around Leningrad thus leaving a smaller northern bulge as well, it is entirely feasible that capturing and holding Moscow would have led to a 1941 version of Stalingrad but with Arny Group Center being cut off.
The more I look at this decision the more I believe it was the right one.