I haven't tried them personally, but I think many people feel that cartridges are outdated
I totally agree, but if someone feels that they really want to try that option, I have many empty, unused, laying in a box, so PM me and I could send you some to try..... no need to buy them at this point. Regular mail is so cheap and I will never use them.
I personally prefer atomizers with a drip tip, dripping directly on the atomizer, but many prefer cartomizers or tank systems. It's all of matter of personal vaping style. I am predominately at my home work desk most of the day, and the dripping gives me a purer flavor. When I am going to be out on errands all day, a cartomizer is more convenient.
Do not worry, you will find your niche, do not pressure yourself, and you have made far wiser "first" choices than many of us made, so cudos to you for doing your homework.
Back in the "old days", when I started vaping, the choices available where not as varied. The technology is progressing every day, so we are in for many and varied improvement in the future.
You should be able to PM if needed, once you have I think 5 post in new users forum.
Happy Vaping and good choice IMHO.