As a technician who has worked a lot on both variants I can tell you the 5 cylinder will give you more trouble free ownership, especially at higher mileage. I'm not a fan of the Drive-E engines in non-SPA cars. If you get one, I'd urge you to at least get a 16 or one that has already had pistons put in it. The 5 cylinder will probably give you a trip to the dealer for an oil trap or maybe a leak detection pump... the 4 cylinder (unless already addressed) will almost certainly bring you in a couple of times for fuel pressure sensor issues, EVAP purge line issues, oil trap, and for sure an o2 sensor. There's also undoubtedly going to be a start/stop issue. This might sound like I'm nagging a lot, but I don't think the VEA 4 cylinders are bad per se, I just think they had some teething issues in the P3 vehicles. I don't personally see much difference in power between the 5 and 4 cylinder (unless you get the supercharged version), the MPGs are slightly better because of the newer gearbox... but not extremely noticeable.
If I were you I'd probably look at a 3.0 T6 in those cars, way more fun than either.