I've tested the 1.4T, but not the 1.8. I've also driven an older Cobalt with the 2.2, and I actually preferred that to the 1.4T motor-wise, even though the Cruze is a very nice step up from the Cobalt in terms of fit/finish/ergonomics.
The 1.4T just felt really sluggish to me. At 138hp and ~3100lbs, I directly compared it to my Focus at 140hp (less torque though) at 2550lbs, and was supremely unimpressed with that aspect. That's like driving around with two very fat people sitting in your car by comparison, and anyone who's driven a 4-banger econobox knows that you can definitely feel that extra weight. That's a little irrelevant though as the new Focus is just as portly as the Cruze weight-wise.
All of that is pretty much beside the main point why I would prefer the 1.8 though if forced to buy a Cruze : It's an econobox. The fuel economy isn't impressive enough to be worth the extra cash, and for anyone who wants to drive the car until the wheels fall off, going with a smaller motor with more parts is just another thing to hassle with at some point. Say the turbo lasts to 200k miles, well what if I want to drive it for another 100k? I have to spend a fair amount of cash to deal with that issue.
SkyActiv Mazda3i trumps the 1.4T in every possible way other than a stupid looking front end and even lower quality carpet. No turbo, better motor, excellent fuel economy at 28/40. Speaking of fuel economy, by experience here in TX and probably most places that get insanely hot in the summer it feels like turbo vehicles get a pretty big penalty in response, at least in an '06 STI and my old DSM turbo piles of crap. Maybe the newer models are less affected by these heat waves.