I don't know much about the TWAX, so you'll need someone else to describe and compare it, but I got the EVO and E-Nano, so I'll do with those.
I got the EVO first when I was into luxury all-glass tasty huge clouds.
I loved how I could load anywhere betwwen 0.05 and 0.5 grams and it would always vape it all excellently without any stirring.
Awesome taste and impressive cloud, especially on the bigger loads.
It's large and pure convection, so you need a large long hit to really get it going. Large lungs are great for this unit.
Then I started microdosing and got the E-Nano.
I love how simple, beautiful, easy to clean, ready 24/7 and reliable and indestructible that thing is.
It put my mind at easy that I have a vape next to me that could be ready all the time and neven break or fail.
And it could be immediately loaded, hit, and emptied within a minute or two.
You requirements are kind of mix of both:
#1 most important... I want to avoid VAS and buy ONCE... I am not made of money and I want to buy one ideal desktop unit, just once, and walk away. Too many other interests and demands on my cash to play the "vaporizer of the month" game!
I though EVO ended my VAS for a logn time and it did for about 2 years, until my requirements have changed.
Now I'm more into microdosing, less into luxury and taste, and want peace of mind of not worrying that it will break.
So I got the E-Nano and if my new requirement stay, then I'll not get anything else for a long time or ever.
* Fixed electric table unit, to be used with and without glass water pipes.
- Both EVO and E-Nano equally great at this. But both can also be quite intense and hot and dry when used without water.
- So I prefer them both with water.
* Ability to use as much, or as little material as desired.
- EVO, E-Nano is for small load only, but can be reloaded very quickyl and easily and it vapes one load very quickly.
- But E-Nano also might lose some heat after one or two loads if you go too fast on it and you might have to wait a minute for it to reheat if you want to vape a lot in a row.
* Excellent flavor and cloud volume.
- Both great, but the EVO is 10/10 at this.
* High reliability and high quality materials. I HATE the warranty repair game!
- E-Nano! EVO has a glass core and if it breaks you'll have to send it in to get it repaired and its not that cheap.
- Also EVO is more complicated, so there might be defective units, E-Nano is so simple theres not much to go wrong.
* Good aesthetic looks and fit/finish.
- Both look great, but the E-Nano is beautiful. Some other logs can be even artistic. But I like the simple E-Nano.
* Whipless, Bagless design with short, clean vapor path.
- Both EVO and E-Nano.
* Ease of use and maintenance, though I'm not opposed to a bit of tinkering if the unit is worth it!
- Also both, but the E-Nano is smaller and cleaning its bowl is quicker and easier to me.