I like the Mercedes. I have always been a Mercedes fan - dunno why. I had one when I was younger (hand me down from Dad) and it was so quiet and quick.
I like the 550.
I think the look of the Mercedes is sleeker and unique. You could mistake the 6 for many other convertables these days. Same lines etc..
The Mercedes has more HP, more torque and a larger engine. The same valve configuration.
It has less cargo volume but more passenger volume.
It's has more airbag options and the console doesn't go all the way back flush againts the back seats. Better for the ninja.
I compared all 3 of them here: (I hope the link works
)
You can switch em around and compare in categories- performance- safety etc.
http://autos.msn.com/research/compare/default.aspx?c=0&n=3&i=0&ph1=t0&ph2=t0&tb=0&dt=0&v =t104196&v=t103320&v=t103381