I can see where both sides are right. It all depends on your car just like different people can run smaller pulley sizes than others.

It's half preference, and half mechanical. I don't really see the argument of beating a dead horse here....if you have a tuner then you can take full advantage of either.

FWIW I have a 180 and at highway speeds my temps seldom see 170 let alone 180+

It all just depends on where you're at with what you've got I think.