The EC3 connector's are essentially smaller corally's in a body, so stick with those if you have battery's with wires coming out of them.
The contacts in the EC3's are 3.5mm in size, and rated to 60 amps. They are slightly smaller than the 4mm corally standard, which are rated to about 80 amps, but are still rated higher than deans at 50 amps.
If your using lipo's with 4mm tube's in them, then the 4mm corally tube is the only option. Using anything else puts another pair of connectors in your wiring...and every extra connector you have is another risk of failure. I use the standard 4mm Corally's due to the extra current they cope with...and my lipo's having them built in.
I'm not a fan of deans generally either.
I have just noticed though, they do an EC5...5mm corally style...120 amps!!! They look interesting too!
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