I got a cadetship for audit at one of the big4 however I've been told that audit is one of the lowest and easiest roles to get into. I heard that co-op programs would be a better option as I would he able to explore different areas and wouldn't be confined to that particular service line. I was wondering what the overall service line 'rankings' (if you were to rank them). I would very much appreciate it if anyone who has had any experience as a cadet in audit be able to share their experiences?
As mentioned above, I don't think you can really 'rank the service lines- it's not like there's a best and worst as it depends on a multitude of factors, and even then, there are things like industry specialisations, market positioning of each firm, location, etc which all comes into play. As for ease of getting into, I don't think any of the services lines are 'easy' but as also mentioned, it could just be a numbers game since audit traditionally hires more people at junior levels (at least in my experience with my firm). There is also an air of exclusivity/eliteness to some services lines or business units in some firms, but that could also just be a numbers thing where they only hire so few people.
For your personal situation around cadetship vs coop, Chronost is spot on. Coop is great if you don't know what you want to do as it improves your exposure and likelihood of getting a graduate role at a sponsoring organisation. On the other hand, cadetships are really more if you want to stay within a particular firm or service line and progress since it does allow for faster progression (assuming you do well).
FYI I'm from audit. Over the years I've done a few international secondments, a few client secondments, and have moved from pure audit to also doing risk consulting.