It looks like striker fired handguns have a slight lead. Why is that? Simplicity, cost, durability?
If I were guessing I would say trigger pull.
There are three kinds of autoloading pistols:
Single Action
Traditional Double Action
Double Action
The single action must be cocked with a round in the chamber to be ready to use, and typically has a light trigger pull in the 4.5-7 lb range.
The traditional double action can be carried with a round in the chamber but not cocked, since it can be fired DA for the first round, and all subsequent rounds will be fired in single action. These pistols will have a decocker lever so the user can load a round into the chamber by inserting a loaded magazine and racking the slide, thus cocking the firearm, and then decock so it can be carried with, what is for some, the more reassuring heavier double action trigger pull, typically in the 8-12lb range.
Finally the double action only is just that. You put in a magazine, rack the slide to chamber a round and the gun is not cocked. You have the long, heavy double action trigger pull for every shot, which some people find more reassuring for everyday carry.
As to striker or hammer fired, some of the striker fired guns, like Glock, preload the firing pin/spring as a partial cocking to allow for, presumably, an easier trigger pull and better feel.
I typically carry a 1911 style pistol or pistols which are single action and hammer-fired.
For a revolver, I prefer a shrouded hammer, and favor the Ruger LCR with it's improved double action trigger. In most any concievable self defense use of your pistol, you would not be firing in SA, so there is really no point, in my opinion, to having an exposed hammer or being able to fire your self defense piece in SA.
Just my opinion and of course opinions do vary.
best
mqqn