It just goes to show that people have very different views. I think when I hear people thinking out loud (ums and ahs) it's a marker that they are actually engaging with the question, thinking through an answer and not bullshitting without thinking.
Just randoms "um" inbetween because your struggling to build sentences can get annoying both in person and online
The first one indicates something along the lines of "thinking, please stand by". The second one is a struggle.
But hearing them from an interviewee drives me crazy, along with "sort of", "kind of", etc. I once counted all of the "sorta"s in an NPR interview, it was brutal.