I've played Shockforce and Chain Reaction 1 but years ago so I hardly remember many details. I don't know CR 2.
Shockforce has a pretty decent design system for troops whilst the CR 1 design system is rahter rudimentary. Shockforce rolls lots of dice and figures die very fast. I think it handles more models than CR 1 does. CR is a bit more detailed and tactical because of the reaction system. I found the reaction system an interesting idea but it can make the game very defensive since sitting in cover and waiting give you the advantage. A realistic but not necessarily very exciting situation. Now this might be different in CR 2.
Alternatively I can recommend Supersytem 2, at the first glance no near future setting but the character designs system can be easily used for the topic, you can make monsters and it even handles vehicles very decent. Also the game system is very elegant. Downside is that making the detailed characters needs some time. If you are willing to invest some work beforehand I can recommend it wholeheartly.