How does Moderna's COVID-19 vaccine candidate compare to Pfizer's?

Moderna's initial results of late-stage trial show its COVID-19 vaccine is 94.5% effective. Pfizer last week said its COVID-19 vaccine is more than 90% effective, citing an initial analysis of its late-stage trial. While Moderna's vaccine can be stored at normal fridge temperatures of 2-8°C for 30 days, Pfizer's vaccine can be stored at 2-8°C for five days.