The Provari P3 has been getting raves, but if your budget won't go that far...
I have several regulated tubes.
My SVD has been a good performer, more than a year old, but did lose it's fire button "click" rather early. Still works fine, just no tactile feedback on the button.
A Vamo v5, KSD make, works fine.
A KSD K-Max, works fine, but it does run "hot" (average, not rms regulation), and I actually prefer the multi-button interface to the single.
And two Tesla VV/VW mods. Slightly triangular cross section, deep grooves so good grip, multi-button, RMS. If you're not looking for high power, a good choice imo. And since they're aircraft grade aluminum, very light.
Of course, there are new models frequently. Vamos are up to V8 or 9 already! The SVD V2. And there's a new Tesla VW out as well.
Another thing to consider is whether or not you want to be able to shorten it up. Telescopic ones like the SVD, just spin to fit the 18350 or 18500. Vamo, take a section of the tube out. The Tesla is 18650 only.