My name is Emmanuel and I'm a Joint Honours degree student of History & Politics at Lancaster University. The evaluation of your prospects very much depends on where you want to study, but I'll throw in my 2 cents about your cons about Politics just to make you think. You can't get around the essay writing 100% at Lancaster and most other places, but the course is very different here to A Level. Students have to complete a core POLI100 module that incorporates aspects of the A Level syllabus but extends far beyond this scope and includes research-led material from lecturers in the department. I never had the opportunity to study A Level Politics myself, but my 1st year showed that if you do your research, it can be a lot more diverse and engaging than the constraints of studies in Sixth Form. Career paths and salaries are also very much contingent on your portfolio ahead of leaving Uni. At Lancaster, the PPR department frequently informs students of opportunities to undertake paid research projects, you can become an Ambassador for the Department and Placement/Year Abroad options are available as part of courses— let alone all the vacancies for jobs the Uni offers itself more broadly. All I'd say is drill down into the specifics of where you might want to do either subject and you might be surprised with what you find out.