I've had great luck with both of those ATO's on small tanks. I always used the JBJ with an aqualifter so I can't speak to the BRS pump in this configuration but I've run that pump for auto water change on a small tank with sucess.
I think it will really come down to whether you want float switches or optical switches. The float switches need a bit more room and are a bit prone to build up causing them not to slide. The optical seamed to need cleaning more as debrit and coraline will set them off just like water will.
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