Following up on this thread it might be "dangerous" to post the following:
The C-47 is the best ww2 a/c
because; ?
1) the best fighter was a C-47
2) the best heavy bomber was a C-47
3) the best medium bomber was a C-47
4) the best ground attack a/c was a C-47
5) the best sub hunter was a C-47
6) the best night fighter was a C-47
7) the best transport a/c was a C-47

the best sea plane was a C-47
9) the best recon a/c was a C-47
10) the best trainer a/c was a C-47
Let's assume that the C-47 was indeed the best transport a/c, so does 1 out of ten criterias make any a/c the BEST of all ?
Even in a direct comparrison to a Ju 290 it wouldn't stand up to being the best transport a/c. Fact is that Germany lost the war and as such Douglas could market the C-47 unoposed, which makes it at most - the best post war transport a/c.
Which a/c had the overall biggest impact in regards to the outcome of WW2in the ETO or PTO ? the answer according to Gen. Eisenhower is C-47, to me it would be thousands of B17's and B24's or sarcastically the B-29 over Japan during a week in August 1945.
Which a/c had the means to forward the future layout of any transportation or civil airliner after ww2, the answer (IMHO) would be a C-47 a Ju 290 and even a Fw C-200 ex Condor/Lufthansa
So to my understanding this answer could only be verified by setting up certain criterias and make a poll out of it (I think this could be an interesting alternative).
Regards
Kruska