The Xtronics is a 75w iron, and the Hakko is 65w they are both rated to 900degF, And they will easily handle soldering jobs up to 10gauge without problem.(I don't solder anything bigger than 10 so can't speak to it) I've been using an 888 for work, and hobby purposes for years.
The solder I use and recommended melts at 360F(so do most quality leaded electronics rosin core solders) and a tip temp of 625F or so works great with it.
Running a hotter tip, or an 1100F+ degree soldering gun just instantly vaporizes the flux and even some of the solder, and puts way to much heat into joint. That much heat will damage the insulation if doing wiring(especially cheap aftermarket PVC/vinyl coated wires) and can damage the conductor, burn out resistors, LEDs and other components.
Having a properly sized solder (.015 - .030" max) when doing fine work especially and all work in general is a key part of a quality joint,and something most people get wrong. Additionally realizing it can take a few seconds to get heat into your joint to melt the solder is important, a little bit of dwell time might be the right tactic, not a >9000 iron temp. That said, with my tip temps, on a circuit board or typical 16-24awg auto wiring I work on, tip on work time is about 5 seconds or less. Even on 12awg to 12awg wire splices it's not any longer.