I have had both. I never really based the purchase of a firearm on whether it was a hammer or a striker nor did I base it on a SA or DA. I just would know what i wanted in the firearm, what it was going to be used for and then would find the gun to that criteria. When I was looking at 45s I was looking at a back-up gun for hunting. I wanted a gun that could hadle the elements and if it got dirty I would not have to clean it for the gun to work properly. I ended up with a Glock 21. Now with the 1911 that I am currently looking for, I know what I want and the manuf'r that I though I wanted turns out that I did not want. It just does not have the features that I am looking for in the gun.
I don't think that I could want a new firearm and start with "I want a DA" or "I want a SA" that would leave me with to many options and then I would not even know where to start. If you are looking to purchase a new firearm I would suggest that you make a list as to what you want in the gun. With the 1911 that I am llooking for this is my list:
extended beaver tail (i hate hammer bite)
Gi guide rod (full size I am not a big fan of, taking the gun apart should be easy)
great factory mags
neat looking grips (I don't want to have to buy new grips as the very first thing)
Match grade barrel and slide (tight fit)
I thoght that I wanted a Kimber when I started off but Kimber does not have over half of these ithems and the warranty sucks. If the warranty sucks on a gun that sums up what kind of quality of the gun you are getting. A lifetime warranty means that the company believes in its product and does not think its going to see that gun much or at all after its is bought. A 1 year limited warranty means the company that makes the gun plans on seeing the gun right after purchase and a few times after that and hopefully the warranty will expire before they need to replace the gun.