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DASH is the best POW coin. NEM is the best non-POW coin. There are probably some very good use cases for both.
Dash is mix of POW/POS now. POS part in masternode part with voting and stuff like that.
1000 Dash to run a masternode.
ROI currently 9.12 % on annual base.
* VPS server costs excluded.
* ROI is scheduled to diminish over time as Dash has an annual 7.1% cut on its block rewards (we just had such a 7% cut on our block rewards very recentely)
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NEM have fixed supply in order NEM masternodes to shine NEM have to be wide used then fees will cover operation costs and this is fair, you want earn you need make NEM big and widely used. While Dash want be currency then want be more like system/data transfer.
To be honest masternodes have some myths you need to know that at some point masternods with 9% ROI is BS.
Try today be a sucker and buy for your "BTC" "NEM" Dash masternode : ) . Once those masternodes will stop increasing and will , they will pay less an less over time if price wont rise with nodes all system collapse and you will see not dumpig like 1 Dash but with 1000

Dash at once.For me price of dash is hyped a lot but time will come to rebalance it/correction like it was with NEM and jump to 2800 sat

.
Nem is flexible if will be widely used you will get allways NEM from transactions, but it need to be used.
This is POI so you have to USE your nem to have bigger PO
I ... More you use NEM more you earn.
Good luck for all Dash users.