Both the coins seem good.
Viacoin recently released Viacoin Core 0.13 Beta with segwit(waiting for signaling).
Screenshot from their website:
https://i.imgur.com/EB9CRY5.pngViacoin remaining milestones for the year 2017.
1.Hardware wallet support
2.Lightning network
3.Anon implementation.
Gridcoin has lot of milestones for June and July none of which is accomplished yet.
Screenshot from website:
https://i.imgur.com/NnW9RNq.pngSo, i see a decent development team and the price will go up soon. A huge potential for both the coins, what do you guys think? Planning to invest on them.