I'm not sure.... The TM2 is one hell of a fun vaporizer - but think of it more like a Ferrari or McLaren. It's an insanely powerful device built by a small brand for a nice market (exotic vaporizer collectors). Yes it is one hell of a device. BUT not the device I'd bring out in public all the time because it's not the most durable, it's expensive, and it produces a massive cloud that you don't always need.
Right now the S&B Mighty is one of the top-selling higher powered portables on the market. It has dual batteries so it has a very long battery life (and overall lifespan, because it splits the power demand between two battery cells, putting half the stress on each battery cell). Plus I believe it has pass-through charging so you can use the device while charging (at least the original Mighty, I don't know for certain about the Mighty+).
HOWEVER a little birdie in the industry told me that S&B is working on a new vaporizer which should hit the market VERY soon. So I bet you'll see mightys on sale in the very near future.
All that said, I think you might want to explore the world of butane powered portables! If stealth is not a concern, check out the Lotus vaporizer (formerly it's own brand... then discontinued, now recently resurrected by another butane brand called Vapman). Also the Dynavap Vapcap has a cult-like following for a very good reason.
Although you did say you don't want an external heat source......
So now I'm trying to figure out what other high powered portables would be worth considering.....
Yeah maybe the TM2 will be a good fit for you personally.
Just know that the heater is extremely high powered and you might find the vapor a bit too hot/harsh on it's own. So you may need to use mods like aftermarket stems. I myself made a 3D printed stainless steel stem (and detachable mouthpiece) with a helix twist internally to cool down the vapor a bit more.
Have you looked at the Solo2 at all? It would be a much more user-friendly device from a reputable company with a ton of different stem options. It also provides some of the best tasting vapor from any portable device I've handled.
Regardless, know that there is no "Best" device for every user in every situation. Additionally know that using a device becomes habitual and it's good to switch up devices once or twice a year to help reset your tolerances. Not always does this mean upgrading to a more powerful device, sometimes switching back to a lower powered device like the Xmax V3 pro in session mode can be helpful to reset your tolerances.
Have you considered desktops? Desktops give you a lot more flexibility and versatility straight out of the box with minimal or no mods. I'm a big fan of the Arizer ExtremeQ (or the upgraded model - the XQ2 - they're both basically the same device with a few extra LED light colors lol)