Both were very different. Bannister ran a lot less!!!
I am constantly amazed at Bannister. He was genius. He didn't worry about that thing that so many of us fuss over these days....Miles Per Week. He looked very carefully at his goal, his life, his constitution, and went about his business, his way. We can learn so much from this great man. Many will say "oh that was 1954 etc". But I think it is wrong to ignore Bannister's methods and outlook.
There are those who accuse him of not revealing all his training details...ie, perhaps he did 3x2400m often??? Anyway, typically, repeats of 200m to 800m at lunch hour, maybe 3x a week, with hard trials over 1200m-800m on other days. October 400s may have been closer to 70s, increasing from there.
I love how Bannister saw his spedwork as something to constantly develop and master, whereas many of us "modern day runners" make the mistake of seeing speedwork purely as icing on the cake or "sharpening the pencil". There's a big difference imho.
3:59 on dirt is 3:54 on a good track imho. His 2:52 1200m on dirt is his best run ever. The guy was amazing.