It is odd how some of us find different things that just work for our style of vaping. I have no real love for the Zeus, but I absolutely respect the way so many find it perfect for them. Same with the Engine Nano. I just get such a muted flavor from the juices I vape on a top airflow atty. Thank god there are so many options in our vape world.
To be more accurate, OBS Nano and Zeus are side AF tanks, not top AF.
It sounds strange to me that you find Zeus gives muted flavor - I assume you mean compare it with other bottom AF tanks that you own.
OBS Nano and Zeus are the only 2 side AF tanks that I have used and I have tried many type of bottom AF tanks.
1. In term of flavor, even though I did find few of my bottom AF tanks out-perform OBS Nano (e.g. IJoy Exo and Govad) however, OBS Nano is definitely not bad in flavor performance - far from so called "muted flavor".
2. Zeus is currently my no.1 tank not simply because it beats all my other tanks in term of flavor output. I love this tank because of its overall performance.
It is a truly leak proof tank, fantastic flavor and vapor output, great AF system, world easiest top fill
mechanism - all these = it beats all other tanks.