This Skilhunt charger look a lot like cheaper liitokala Li-100:
http://www.gearbest.com/chargers/pp_272183.html
It’s a good charger and supports LiFePo4 chemistry (Xtar MC1/MC1 Plus do not).
If you didn’t already, see HKJ reviews:
Test/Review of LiitoKala Lii-100
Test/Review of Charger Xtar MC1
Xtar MC1Plus Review
For ~4USD a piece you can always buy both li-100 and MC1 Plus and have “independent dual slot” charger 
Regarding cells you can not go wrong with 30Qs but take also a look on LG HG2 cells - but beware of fake ones.
Samsung 30Q and LG HG2 comparison 5A
10A comparison
20A comparison
So lower voltage sag over 30Q at any current.
EDIT: well it’s pretty similar at 20A but that current would melt some stuff 