I have been running the EC5 plugs from SMC (they are different from the EC5s from E-Flite) but they are very difficult to plug and remove. It's gotten old, so I am switching to Traxxas plugs. That way all my vehicles will be on the same plug and can use all my batteries in all compatible vehicles.
I know Deans are very popular but I never had any luck with them. I was using the genuine Deans and they would come apart during a race. Putting a zip tie on them every run got old as well. Ditched them quickly. Maybe it was me and my soldering job making the plugs loose. I figure if it was that easy to not assemble them correctly, they weren't the plug for me.