They are both very capable aircraft.
Get a flight in each on the same day so the conditions are the same and compare the ride.
I did this with someone who was 95% set on the Grand because it was newer/bigger/faster/shinier than the power it changed the view and indeed his mind.
Beware the sales pitch 3 ton is not certificated for elevated helipad on the power so if that is your need/want then make sure you look at the figures in the flight manual, not the ones the salesman wants you to see and make sure the delivered weight is what you expect, they are getting heavier by the month.
If you want to remove the headrests to make it a bit more inclusive, make sure the certifications allow it.
Enjoy