I used to have a 2.0TDI 150PS Leon and after a 1.0 EcoTSI 110PS
Ibiza SC. 1335 & 1140 kg respectively. Both were DSGs. I've also driven a few times a 1.6 NA Golf FSI Dsg 113PS.
The 2.0TDI has a wallop of torque that pushes you into your seat, at any gear, at any revs more than 1500rpm, Even pulling out of a roundabout in 2nd (gear choice by the car), this is not a
problem. If you previously had a diesel with 150 or thereabouts horsepower you would know the feeling. If you had a 'lesser' diesel with around the 100 horsepower mark, perhahps not.
The 1.0TSI however, struggles a bit (even in a small light
Ibiza) from the get go, you really need to be at least at 2000rpm to move anywhere, and don't expect any shove in the back feeling. That said however, I felt the 1.0TSI much more diesel like due to the turbo it has, compared to a 1.6NA Golf, which I really needed 3k - 4k rpms especially if joining a motorway. The 1.0TSI perhaps you only need up to 2.5k rpms to make the same progress. Economy for both, were exactly the same, long term 50% London city, and 50% extra urban (40-50mph), I got about 45mpg on both. 1.0TSI and 2.0TDI would both do 55-60mpg on a highway run at or around 70mph.
If you previously had NA petrol engine, you may find the 1.0TSI suitable fast compared to all other 'bigger' NA engines. Many people who sat in my 1.0TSI
Ibiza, all thought it was a 1.6 or a 1.8, and gasp when I said it was 1.0 with 3 cylinders.
If you haven't driven a small turbo petrol before, I would say you would be quite impressed. Experience of some is that VAG 1.0TSI have more low down shove than 1.0Ecoboosts, however if you are coming from bigger more powerful engines prior, you may find the 1.0TSI a big slow in comparison, but you will soon get used to that (as I have) and it was more than adequate, even for overtaking lorries on single 60mph roads.