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I normally don't participate in threads like this because it normally comes down to people trying to justify what they have spent their money on.
My personal opinion is that RedArc are a good Australian based company that do a lot of research and development. Where as some of the other companies well......
The question should be Dave, what best suits your needs.
This comes down to what/how you expect to use your second battery for. Such as, What do you want to run off the second battery?, what type of battery,? where is it mounted?, how long might the vehicle sit before being started?, once started how long does it run for?
Back to your original question. I think RedArc is the rolex and Ctek is, well....