Scylla provides a touch less flavor than the other 2, but barely noticeable. However, it has a lot of innovations, and is an amazingly easy RTA to build. Dvarw and Kayfun v5 have many different characteristics. But they both provide very close flavor intensity, in my opinion of course. You couldn’t loose with either of the 3. If you like excellent flavor, juiceflow control and top fill Kayfun v5 is the right choice, and if you like a flavor chaser with many extras and options, and don’t mind the bottom fill, go with Dvarw. And for ease of build, top fill and operation, Scylla will be the right one.
For custard flavors, Skyline is another excellent RTA choice, and one of the best.
My most recent favorite RTA however, is the Avatar, or Avat in FT. It pretty much excels in all areas and beats almost anything I have tried to date. I have not tried Custard based flavors with it. But I am sure the vapers, who have could give you feedback if you are interested.

Thank you. I lean to dvarw fl dl but it's loud and noisy rta. is the other 2 same loud or smooth?

Depends upon their disposable income really. There are far more expensive vices out there that people 'waste' their hard-earned on every day, that's for sure. However, if one is reasonably minted, even a regular flow of originals and copies hardly scratches the financial surface in my experience.

As for an 'addiction' to kit, I firmly believe that's largely driven by YouTube, and the desire to 'keep up'. Some are swept up in the current, others not.

The only thing I do find daft though, is the regular assertions from those purporting to review, claiming the latest release is 'the best thing since sliced bread'. Bollocks! Flavour performance in RTAs hit it's ceiling quite a while ago now. At the top of the tree, they're all largely the same if built correctly, with minute differences only discernible with the type of e-liquid one prefers (some lean a little towards fruits, others suit tobaccos, etc.)

For my preferred MTL vaping, if I were only able to have three RTA's, they would be:

Atmizoo Tripod

Kayfun Prime

Kayfun Mini V3 Plus

There are others I enjoy as well, such as the Dvarw v2 / FL, Rose V2 / V3, Taifun GTR, Ares V2 LE, etc.. All quite good with their own strengths / weaknesses, but I went by which 3 RTA's I would miss most out of what I've owned...

EDIT, This could all change at a drop of a hat as other new RTA's arrive of course... ;) I have a good feeling about the SXK GG Perseus clone that's on the way, as well as an eye on the new Thunderhead Creations MTL coming soon.. Will they be worlds better than any others? Probably not.. but I enjoy trying them.. :)

I keep everything but Dvarws in a big box 😂