Strike legion if you want something that feels more “techie”
Future war commander for something that feels a bit more generic and gamey (at least to me). Also easy to pick up if you have played BKC or CWC.
I have both and they are both good in their ways.
Interest include 6mm WW2, 6mm SciFi, 30mm Old West, DropFleet, Warlords Exterminate and others!