I'd go for as much milestones in arena as you can. When I'm grinding for units I use my 5/50 and 5* champs in the featured arena and my 4* 4/40 and 3/30 in the basic arena. Once I got all the basic milestones I start in the 3* featured while still working on the 4* featured. I generally reach full milestones on the 3* and basic arena while reaching 3mil in the 4* featured. This adds up to 305 units and a ton of battlechips (35.750 from milestones alone).
In total this gets me about 600 units in three days. I have time to do it twice a month. The other sixs arena's I run less intensely or grind for a champ.
With the event quests and the solo and alliance events I get about 4k units a month even if I don't have time for all the arena's, around 6k when I grind them like I want them.
I'm Free2Play, until the $1 crystal but nothing more.
Already earned tens of thousands of units from Arena grinding and battle chips opening.
Spent most of the units for multiple T1a/T4b/T2a deals, gifting, replenishing energy, recharge champs under boost to rush for arena's last mile, and various other special deals.
Of course this requires alot of time & effort, and repetitive fightings round and round. I heard some folks are using some kind of bots, but pls don't even think about it, bcos you'll regret it when the ban comes your way. Just keep your head down with old-school grinding. However if you can't afford the time to grind, then the only easiest way is to purchase the unit deals with real ca$h. Good luck & happy arena-grinding
Most people with jobs/school/lives do not have time to grind as much as a professional MCOC player whose job it is to grind arena. So focus on taking down the 4* basic and then 4* featured if you can. I believe these yield the most units per milestone.
By the way, I don't believe that you can hit all milestones in all arenas grinding 3 hrs/day....that is fake news
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In total this gets me about 600 units in three days. I have time to do it twice a month. The other sixs arena's I run less intensely or grind for a champ.
With the event quests and the solo and alliance events I get about 4k units a month even if I don't have time for all the arena's, around 6k when I grind them like I want them.
I'm Free2Play, until the $1 crystal but nothing more.
Already earned tens of thousands of units from Arena grinding and battle chips opening.
Spent most of the units for multiple T1a/T4b/T2a deals, gifting, replenishing energy, recharge champs under boost to rush for arena's last mile, and various other special deals.
Of course this requires alot of time & effort, and repetitive fightings round and round. I heard some folks are using some kind of bots, but pls don't even think about it, bcos you'll regret it when the ban comes your way. Just keep your head down with old-school grinding. However if you can't afford the time to grind, then the only easiest way is to purchase the unit deals with real ca$h. Good luck & happy arena-grinding
Hope this helps
By the way, I don't believe that you can hit all milestones in all arenas grinding 3 hrs/day....that is fake news