Alan Wake has good gameplay, a fun story, a cohesive world (with consistent graphics all the way through) and good characters. It's got a lot of things The Evil Within lacks, but the one thing TEW has over Alan Wake is the gameplay. Most people who grew up with old school RE and RE4 can appreciate how nicely TEW handles it's battle scenarios, how nicely balanced the weapon system is and how finely tuned the enemy/boss encounters are. It's not the most optimized game graphically, but the shadows, texture work, environments, and sound production are of absolutely great quality in TEW.
I vote for The Evil Within, but they're both great horror games doing things differently than REmake, RE4 Dead Space, SIREN or Silent Hill.