I didn't want to reply until I had tried these for a while but I have some definite conclusions. Note this is all subjective, YMMV. I have tried the Davide, Gamma V2 clone RBA, the Arnold RBA, the Kanger Aerotank and the Aspire Nautilus on my SS V5 and SS V3. Hands down the Aspire Nautilus is the best. As far as V3 versus V5, there is no diference. You ought to see the Nautilus on an EGO-C spinner LOL but my wife loves it she doesnt want a big mod so my challenge is to find something smaller that gives the same vape, I think I'm in trouble on that one because unless there is a smaller tank that uses the aspire nautilus coils I'm outa luck. I know but she finds all the others too harsh except the Arnold but it is gigantic even on the VAMO. So I have watched lots of videos and have just started building by own coils and wicks, so far just silica but the Arnold gives wondeful huge lung hit clouds of full flavor and not too hot, its just well huge! Which is cool when I'm home but not for carry. While I'm waiting on my second Nautilus to come I am still using the Kanger Aero and it is very nice, good smooth full flavor but just a tad hot. So I learend some things trying different coils, 3mm wicks, doubled, singled, different gauges of Kanthal, different number of turns, pre oxidizing and not and always letting my wife be the unbiased judge. If a vape is hot she doesn't like it, she finds it too harsh, she can taste it on her tongue and makes her throat raw. Now keep in mind she is still smoking Pall Mall analogs and trying to get into vaping but what has held her back has been the hot issue. Since she doesnt like large APVs I started her with a mini Davide on an EGO. I used a full size Davide and used Kanger replacement coils on both. Hands down the Nautilus is her choice. Yep looks awkward on the EGO-C twist but hey, if it works for her then great.
As for myself, the only one that I have been unhappy with and cannot vape is the Gamma V2. The issue is wicking so I am trying 2mm silica, SS rope and mesh next on it. But as for the rest, I can vape any of them all day long. Although that Arnold is just plain sic. LOL ginormous full flavor cool vapor, and to the wife as well. The rest she finds too harsh. She can taste it on her tongue. So for me, the Nautilus is my first choice, the Arnold second (just cause of it's size), Then the Kanger Aero third (a tad hot but not too much, I can vape it all day I just prefer the Nautilus which produces more vapor and is cooler), Then the Davide and mini-Davide, they vape the same which to me provides a harsher or hotter vape than the Aero. And the Gamma dead last, I'm going to have to find a better way to keep the coil(s) on it wet enough because while it doesn't burn it is a hot vape I also have a pyrex RSST on the way so we'll see if the larger size helps.
1. Nautilus
2. Arnold
3. Aero
4. Davide(s)
5. Gamma V2
I run the Aero at 8W in RMS mode, the Nautilus anywhere between 8 and 12W and the Arnold at 15W. The Davide(s) at 4W.
A note on both the Aero and Nautilus, drop a drop of juice down the coil barrel, put it together, fill it, let it sit for 5 minutes then start pulsing and puffing at 4W and turning it up to 8W. The first several puffs are going to be nasty and metalic so dont inhale on those new coils but after a few minutes of puffing then they start to tasting really good and you can start vaping. I am assumig that is because the coils are not oxidized but don't know for sure. I have tried the dry burn method before and I just cant get the hang of it so I break mine in by short pulses and puffs.
When it comes time, I'll also try rebuilding the Nautilus coils. I may even try the Aero coils too.