The selection of guitar strings is a personal one - that is why there are so many choices! But for a new guitarist, it can be confusing. This article summarises the key differences between 80/20 and Phosphor Bronze Acoustic Stings.
Key Differences between 80/20 and Phosphor Bronze
Bright with more bass
Some describe as "louder"
Can accentuate bass by selecting suitable gauge
Reach full sound potential after a few hours but the bright tone will fade quicker
Longer lasting tone
Impacted by sweat and other environmental conditions
More corrosion resistant
Require cleaning more regularly to prevent oxidation, prolong tone and resist breakage.
Recommend cleaning after each use but is more forgiving if you don;t maintain a strict cleaning regime
As with many musical instruments and accessories, it is a personal "thing" and very susceptible to your context - your guitar, your equipment, your playing style etc.
The only sure-fire way is to do some research, keep adopting & adapting - inform, transform and perform!