Do you really want a gun style, or would you prefer an iron style, with that much wattage?
I have had the same Weller gun, for at least 30 years, but, in that length of time, Weller may have started taking shortcuts, on quality... I just don't know.
If you really want a gun-style, I would say to stick with the brand names; the no-names guns are definitely junk. Also, see "Mr. Carlson's Lab," on YouTube, for an easy to make, DIY tip, that helps pass the high heat, quickly.
High wattage irons are available. I am pretty sure JBC has them, but that will be big money. Also, I think the newer technology T12 type irons get that high... Here is a hack...
https://www.hackster.io/sfrwmaker/soldering-iron-controller-for-hakko-t12-tips-on-arduino-f7a888For me, the iron-style would be the more versatile, and, therefore, the better choice.