I like Medic as the ROI is awesome and you can have shared masternodes which means you don't actually need that many coins to get involved
I like the idea of GINcoin (1 click MNs) but to be honest just getting a shared MN with medic is even easier as they host the thing for you for free
I was looking into DIVI but there seem to be big delays, so maybe one for the future.
I've heard Walton is a good one, particularly if you have guardian status.
Interested to see other peoples replies!
Which ROI are you looking at with MEDIC
Cash value or BTC value?