My missus has a 90hp 1.2 polo & we test drove the 1.0L T-ROC. To be fair it felt on a par with the polo, perfectly adequate around town & didn't feel underpowered for town driving but you could tell it wouldn't have much mid range torque for motorway driving. I ended up going for the 1.5 evo petrol with 150bhp as it wasn't much more than the 1 litre engine. Really glad I did, it's a lovely drive, way quicker & torquier than I expected for how big the car is. I've come from a 184 hp golf gtd diesel & thought the t-roc would be woefully slow in comparison but it really isn't. If your mainly driving around town I'd go for the 1.0, but if your going to be using it on motorways i'd Definitely pay the slight extra for the 1.5