I have no complaints with my 1.6L. And I'm still running the stock rearend. It is all about your goals. Both cars have the same rods. There isn't a hole heck of alot of weight difference. The 1.8L has some extra displacement and a larger rearend.
and 1 inch larger rotors.
Turbo the nicer car for street. If you only have a $1000 budget, i would go 1.6L. You can use a greddy kit.
If money isn't a object, I would do the 1.8L.
If it where me, I would turbo both.
A used greddy on the 1.6L. Baidaids and low boost to be a dead reliable to work car.
And make the 1.8L the beast.
Either is capable of 250hp. The 1.8L is easier to get more hp out of.
One guy on here has a 300hp 1.8L. But he has custom tailored dp and etc.
I like the 1.6L for the availability of cheap parts. The 1.8L turbo stuff is a little higher. But when it all comes down. The 1.8l car is a better platform, if you are going to run stock brakes and everything.
With that said, I have no issues with my brakes.
Both are good. And if you already own both, I would probably do the 1.8L car. But if you are buying a car, and they both are very nice, and there is a turbo kit price between the differance. You have to consider that too.