I've heard there is a noticeable difference between the two. I just installed mine (resonated) on Monday. Paired up with a stock IPL (Nismo) exhaust, there's a slight increase in noise. It does make the exhaust sound better overall and there's a small amount of deep bass increase (borderline droning but not quite) for a few hundred rpm below 2K. Turns into a nice smooth burble above and a scream higher up in the rpm range. Too much rain to really test them out at the moment.
There's a big increase in vibration at idle. You can feel it through the seat, pedals, steering wheel, shifter. It's due to the lack of a bracket which I still contend should be addressed by FI for the cost. I'm going to go to the extra effort and cost to have some welded up and installed. Otherwise there's no support between the header to cylinder head bolts and the rear muffler section. That's a lot of pipe length without brackets.
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