Synology DS1522+ vs QNAP TS-435XeU-4G

Hey everyone. I'm in a bit of a dilema here about the NAS mentioned in the title.

I've narrowed down my list to just two:

• Synology DS1522+ and
• QNAP TS-435XeU-4G

Why I like the desktop Synology?

• 5 bays
• 8 GB RAM
• ECC RAM
• (from what I heard) less noise, given it has bigger fans

Why I like the rackmount QNAP?

• ARM CPU (slightly less power consumption)
• 4 core CPU (vs. 2 on the Synology)
• network!!! 2x 2.5 GbE, 2x 10 Gb SFP+
• I could mount it nicely in the rack cabinet I'm building

Both units have similar price, similar power consumption, similar level of noise (please correct me if I'm wrong - this will be sitting in my living room for the foreseeable future).

Anything I am missing? What else should I consider to make an educated decision?

NOTE: I never owned a NAS, I don't know the software specs on the two. I am a software engineer, so I like something allowing as much control as possible, running in a private subnet on my network.