So which will be the better vaccine or does it not matter
We don't have enough data to say, plus it depends what you mean by "better". Comparative conclusions on treatments should be done with extreme caution unless done head to head in the same study -the populations, study design geography and endpoint criteria differ between the studies.
Prevention of all symptoms, all are good, Pfizer and Moderna look better
Prevention of severe disease, all are very good, the data looks comparable between them (numbers of severe cases in all the trials are low, and entirely on the control arms)
Prevention of asymptomatic disease (maybe a surrogate for transmission??) the only data is from Oxford/AZ.
Prevention of transmission, we can only guess.
Logistics/cold chain, Pfizer is worst, Oxford/AZ best and Moderna inbetween.
Cost, Oxford/AZ is far the lowest, Pfizer and Moderna much more expensive
Availability, Oxford/AZ look to have far more volume available than the others, both UK and worldwide
Just my personal view based (except for Oxford/AZ) on press release data, so treat with due scepticism. I'd put availability as the most important criterion right now.
Short version: it doesn't matter. Crack on as fast as possible.