You haven’t said why you need a third iron, without that info no one can rationally comment on how an iron fits your needs.
As for the referenced iron, in my opinion it is junk. The reason has nothing to do with electronics though, the problem is that it is unbranded. I believe strongly in the idea that if you are doing quality work you will put your name on a product. There are plenty of companies in China that do brand their products that includes soldering iron manufactures or resellers. So no don’t buy this.
As for irons I have a few laying about at work and home. Each has its own justification. Butane irons are great for heavy cursor work or simply shrinking a lot of tubing. Likewise modern battery powered units can be extremely useful compared to the units from 30 years ago. A good bench soldering station should be highly valued. Even a gigantic Weller soldering gun can be useful.
Each of the above will fill a niche. The question is what is the niche you want to fill??