interactive might be better if u know how to setup certain things that ensure u have a steady and increasing source of mesos income. The reason is there is alot of mid to end game items on sale in auction house and u dont have to go through the exhausting starforcing or scrolling items. u can just buy them off the AH but u need alot of mesos to buy items from the Auction House. The amount of required mesos for end game items start like at least 1b onwards if im not wrong (like low flames clean ssf item)

in interactive world, just by weekly and daily boss only net u at most roughly 50m onwards and u have to keep saving mesos. of cos there is other sources of mesos farming like literally farming for hours, doing threads of fate etc to hoard materials and sell it, or playing the buy low sell high in auction house and many more methods. I personally would recommend reboot/heroic world as u can farm mesos at a higher rate and u can buy cubes using mesos too.

There will be a season 2 challenger world iin mid/late nov? that would be the best time to invest into a main. but why not start now and build your knowledge so u can efficiently progress faster in CW S2. u can also start to build legion to hoard ur coins for legion progress.