Better is a very arbitrary notice when it comes to either system. The SERT could be considered better because it can get much more detailed when you (or a tech) programs it. On the other hand, that could make it worse, if you don't know what you are doing and/or don't want to pay more $$$ to get it tuned right. The PCIII is cheaper, and while you can get pretty detailed (again if you know what you are doing), it is easier to just get maps and load them into the PCIII, and off you go!

I ended up getting the PCIII for my 05 Glide (Thunderheaders, SE A/C so far). It took me 30 minutes to install and program it for my setup (would've been faster, but I had just installed the pipes, and was a little tired by then!) I haven't had one issue with the map I downloaded from the Dynojet website, and I'm sure it could be tweaked even better if I wanted to.