The 270 is the most aggressive and noisy of the 3 to shoot, I'm not a fan personally but there are those that rate it.
I run a .243 which is a pussycat to shoot and a .308 700SPS which is remarkably gentle to shoot, especially so in comparison with a friends CZ 308! I have no need or desire for a 270, but like I say some rate them.
PRVI ammo for 270 and 308 is similar price although a lot more choice in 308.
Its easy to say and always harder to achieve, but try shooting them first, maybe a club, or a word here to see if someone can help!