Hey livelysocks! I will give you some insight from my personal experience
I started on clearomizers, specifically a kanger t3s, and the coil that came with it lasted me for at least 3 weeks or so. I purchased 8 or 9 replacement
coils while I had it, and the replacement
coils NEVER seemed to work as well as the one that came with it initially. some had problems firing (hesitation) like you said. The ones that did work, worked awesome.. but it seemed like I would burn through them in a week, sometimes even less... like a day and a half. Ive asked the same questions as you, and some say they last them for 3 to 4 weeks, while others had the same problems as me.
Once I got my first RDA and started building my own coils, they are lasting me soo much longer than the replacements for my clearo. Literally I used the first good coil I built for probably 3 weeks, and it was still firing like it was new. I know it would have kept going, but I didn't get to find out, since I have a tendency to build new coils and try them out. long story short, yes I find the diy coils last a lot longer, and perform a heck of a lot better in general. If you do start building your own coils, PLEASE READ some tutorials and learn the cautions that can come with the process. I cannot express enough that you need to inform yourself before you start learning and im sure there are many people on here that would agree with me.
Sorry for the wall of text, I tend to elongate my responses

. Let us know if you have anymore questions!