The consistent advice offered here of "try both" is very good advice.
I would offer one further piece. Do you like to personalise, tune and modify your cars, particularly the engine?
The 1.6 Sigma has a well-proven and well-supported upgrade path including throttle bodies, and freer flowing manifolds and cats ets.
The 2.0 I-4 GDI engine has direct cylinder head injection & ultra-high compression, which will make induction modifications all but impossible, and without these any post-manifold tuning is just vanity stuff.
in short, one engine can trace its lineage back to half of a Yamaha-designed race engine, the other was designed to get a medium-sized hatchback to 40mpg with low CO2 at less production cost a than a turbocharged powerplant. Both very clever engines, one designed by racers and the other by beancounters
