A levels are not easier. I don't think Access courses are easy either, but A levels are probably more stressful because there are so many more exams. If you perform better in exams than coursework then maybe A levels are the way to go, if not go for an Access course.
You almost certainly won't find anyone who has done both A levels and an Access course, or if you do, they did A levels a long time ago or didn't try every hard and so can't fairly judge the relative difficulty of each course. Personally I would do an Access course because it takes less time, they seem to be more structured (so you know exactly what you're supposed to be learning and when), and they are much cheaper.