Easy.. Li-Po battery are generally slimer.. both charging life are the same 300-400 cycle.

Li-Ion are easier to manufacture tho..

both can actually be recycled. so depends on manufacturer see what body of form factor the phone has to use which type of battery only.

for my usage on my s20+ is 4 hours 30 min SOT.. heavy usage la.. some simple daily usage around 6-7hours.. but the phone will self learn to cope with your usage..