Fleck, Clack, Autotrol, all exceptional quality control valves and the most important part of the system. Any of these three are fine.
I prefer Fleck and Clack over Autotrol, nothing against Autotrol, it just has some design issues that are not ideal that both Fleck and Clack have addressed. DIY plumbing a softener can be easy sometimes, other times it should not be attempted. I have installed thousands of softeners over the past 27 years, and some jobs take 1-2 hours, other jobs take several days. Code compliance issues, tool requirements, trenching, etc, and how much your own time is worth can be big factors as to wether you want to DIY or have a qualified person do it. I will work on my Jeep for days on end, I enjoy ripping out the tranny, tansfer case, rebuilding the rear end etc, but my normal cars, I wont even do the oil change, I let the dealer do the service. Again, it depends on your funds, and what its worth to you.
If you can get the system installed correctly, several people on this site will help you program it as long as you have a proper water test.
I would avoid any of the fake knock off systems that look like Fleck or Clack. These Chinese knock-off valves may have NSF certifications etc, but anybody in this industry knows what that is worth.