Ok i am offended at this due to the fact i am using one of each at the moment (one with an A7 RBA and one with a carto
tank different flavor in each) and i find they are both equally good for their design and reliability. Its just a matter of how much you want to spend on an APV and what features you want.
PS the A7 is performing really well on either device, very close in vapor, flavor, and throat hit to the carto (which i am a big fan of and use the most) but the A7 has possibly changed my mind.