If buying hifi gear it's always worth a visit to Richer Sounds.
I got a soundbar last year. I'd recommend one with a sub, this difference in bass definition is incredible.
There's obviously a loss in low end when the sub is off. The soundbar doesn't reconfigure when the sub is disconnected though.
It sounds like you're happy with the Polaroid one you've heard, in a real world setting , not a warehouse tescos or sterile listening room so maybe the decision is made?