Why do many pros preferr limit to no limit?

Hey everyone. I just read this statement recently in another post, but there was no reasoning given as to why. I know that many of you say that you can make a living on 3/6 limit, but is there a reason why you like L instead of NL?

I have been playing full time online NL tables for a few months now. Most weeks I make more than any job I have had before, exept for this week which looks like it will be my second "break even" week so far. I have tried limit tables before (mostly 2/4) but it has not seemed like I did as well. Granted, I have not played for long, because I am pretty inexperienced at limit holdem.

I was just considering studying limit some more (SSHE) but I hoped to hear the reasoning you all like limit more.

Thanks