I spent big money on a Pax 3. The battery in it is fixed (can't be replaced without destroying it) and it will only hold enough charge for 2 bowls (ovens?) Max now.
I highly recommend the Starry 2 or 3 or whatever is the latest by xvape. It's less than $100 and it has a replaceable battery. You can charge it by plugging in the vape to a usb or you can swap out the battery for a fresh one and use a standalone charger.
I also don't have to download an app to get precise temperature control of the Starry. Without the app, the Pax controls are pretty crude. Both come with concentrate inserts and seem to heat up the same, with comparable oven sizes, etc.
The Starry oven is at the top of the unit and the Pax oven is at the bottom. The length of the vapor path doesn't seem to make any difference in the temp of the vapor. The Starry doesn't seem to get as hot on the outside (it still gets hot, just not as much as Pax) and is easier to clean.
They have very different mouthpiece styles, which is just personal preference.
[Edit to add:
They both have a somewhat tight draw but the Pax 3 especially so.]
If I could do it again, I'd just get the Starry and I wouldn't be out hundreds of dollars for the Pax. They won't replace the Pax under warranty until the battery is so dead it won't turn on.
I've vaped nicotine liquid for years so I have more experience from those. A dead (no longer holds a charge) battery is what kills all of them. A replaceable battery is the only way it will last more than a year.
I searched all of the dry herb vapes with replaceable batteries last fall and the Starry was the least expensive one. That may have changed in the past 6 months, but it was the best at that time.
TL/DR: Get one with a replaceable battery, such as the latest Starry by Xvape