Hammer vs Saw.
Assuming I had NO mods at all, between the two I would go Hana (or any comparable regulated
mod). With a large variety of higher liquid capacity drippers and new hybrid
tank dripping systems (rocky, pontus, big dripper et al) a bottom feeder to me becomes less advantageous over regulated low ohm/high power mods.
As it stands, I have a Hana clone and IPV2, while I also have plenty of mechs but no bottom fed mods so I would go REO.