As you probably know, fixed sights may not always hit center using the same gun with various shooters. Fixed sights can only be adjusted left/right, if the gun shoots high or low we adjust accordingly. After time we get to know where the gun hits at different distances and aim accordingly.
Adjustable sights can be fine tuned to the owner/shooter to hit dead on at distance A. We can adjust our aim point if we move target distance, or the rear sight can be adjusted up/down for each distance.
Years ago when I shot pistols (Colt 70 Gold Cup, S&W 629 and High Standard Target Match), all of the guns I owned came with adjustable sights.
The tactical fixed sights were not as common then.
However, recently I got back into pistol shooting and now most of my pistols have fixed sights!! I am now actually considering changing some of them over to adjustables, as I find I can adjust the sights to suit me, so I can hit where I aim and don't have to compensate!
The only downfall is that the adjustable rear is not as rugged as a fixed rear, the main reason they have been used on service/duty pistols for a long time.
If you plan to use the gun as a service pistol, or compete with the pistol, where it will get banged around, I'd go fixed.
As most of us (read ME) only shoot at a range and we can't carry, the adjustable sight is how I would tend to go.
Nice pistol you've got selected there, that very gun, with adjustable sights is on my 'to buy list'!