comparing aircraft whent its about submarines
and...
Comparing a P51 versus a Spitfire...
you guys must be mad.
P51: Long range High altitude fighter
Spitfire: Interceptor
you cant compare as they where of a different fighter class,
if you would have a pool to compare the P51 with it would be-
P-51 , Hawker Tempest and the FW190D ''Dora''
but in general comparing aircraft to show who had the best is just impossible as everything had their advantages and disadvantages:
Advantages : use them well and there is a higher chance of victory for you
Disadvantages : get in a situation where your disadvantages will start to act up and you have a risk to be done for.
but in generals as for Aircraft and submarine alike,
the mix between Men and Machine is also very important.
HunterICX