A career in Pharma sales is all about th ability to work in a very uncertain environment. Big sales or small, launch or mature product, it doesn't matter as it used to. If you are not in the industry and want to break in, take the Chronic Care postion if you can get it. If you are already in the business, scrutinize the opportunity more on what it pays you and, perhaps more importantly, what it does in terms of broadening your experience and adding to your professional network. Those things are more supportive of the security you seem interested in over the actual opportunity itself.