To answer your questions:
Do I have chances at all for doing something more than benchwork for someone else working for the University?
Yes, but only if you define "something more than benchwork" as "something else
than benchwork". Perhaps you could work in tech transfer, or administration, or be a lab manager. But with a BS, if you stay in the lab your title will always be a tech, with the corresponding salary and level of respect, even if you find a PI who is willing to let you do some independent research on your own.
Do I have more chances for advancement with only a BS in industry?
Yes or no, depending on the company. Some are very big sticklers for degrees while others only care about your experiences and accomplishments.
Given that you are saying things like, "I guess I just like the idea of doing research to learn something new" and "working in industry might be a better choice in the long run as... there are more opportunities for advancement," it seems to me that you are someone who not only wants to do research but also has the ambition to ascend to a technical leadership role. If this is the case, then you will most probably need a PhD eventually, even if not immediately. Of course there are the usual caveats about the difficulty of the job market for life scientists, so I would add that A) you be absolutely certain that this is what you want to do and B) a few years in a BS level industry job might actually be a good thing-- even if the company won't promote you without a graduate degree, you can go back to grad school, get your degree, and then let your industry experience stand you out from the other job applicants.
Anyway that's my two cents, if anyone has any alternative perspective feel free to share.