Never hurts to aim high. Also if you're taking statistics modules, you gotta ace those, otherwise the lack of solid fundamentals will come back to haunt you in the future if you're serious about getting into the data science field. Anyway, there is definitely a higher probability with regards to higher salary, but the real hurdle here is getting through the door. You want every advantage you can get. Also you won't get accepted into a "higher" role regardless if you're first class or without honours, because it only comes with real work experience (unless you already start shipping models into production during internships/part-time work then that's pretty insane). Even if you manage to get it, you'll mostly likely struggle due to the expectations that comes with it. Plus the lack of proper mentoring in your early-career will set you back long term further down the road. so yeah, that's my take, and forgive me for being straight forward because too many don't see the causes and effects.