masternodes not earn significant more
but they are a better and high secured way to run
big amounts of DMD in earning mode

masternodes can earn income even if the wallet that hold the coins is offline so its 100% secure to way generate income

this is done via the masternode configuration methode
control wallet / remote wallet

basically the choice is made easy by the fact how much DMD u own

if its above 10000 i suggest create a masternode and run just leftover coins in POS

if u own below 10000 run POS
its way better then the other option
(to not claim ur share of coin rollout)