The Onyx has no balancer and would need a separate one, but can charge up to 7amps and is AC/DC.

The CS charger will only do 4amps, but has a builtin balancer and is a DC charger (need a power supply). This charge rate is limited , willnot be able to do 1C charge on a 5000mah lipo (1C = 5amps for 5000mah).

Kind of a toss up, if you've already got a power supply, the Proton makes sense. If you already have a balancer, Onyx makes sense. If you're really considering 1/8 wher etehlipos will be 5000mah and up, get the Onyx and buy a balancer like the Equinox.