Econ is generally considered a more traditional/ rigorous course than A&F (or similar), but people don't really care that much.
I highly recommend you do not base your course choice on this (tradition) alone. The difference between them in terms of landing a job when you leave is undoubtedly minimal, and it is not worth studying something you don't enjoy for 3+ years. If you prefer the syllabus of an A&F/ finance/ management course over theoretical econ, you should go with what you enjoy more.
If you don't really mind, it again doesn't matter. Straight economics courses will give you optional modules in finance/ management/ accounting, and some A&F courses will allow you to pick up basic economics modules. You should have a scout round the university websites/ speak to current students to learn more about possible modules.
The core concepts of Econ vs A&F will be different, so that decision needs to be based on where your interests lie more - but as I say there will be plenty of opportunity to pick up modules in either.
The key to getting a decent role (job/ internship) will be going to a target/ semi-target and then doing a decent bit of networking when they come around. Have some interesting stuff on the CV and you'll be sweet. There is a lot more to the system than the exact degree you do - and people honestly don't care that much. I only talk about the tradition aspect as there is of course some level of disparity between how the two are perceived. But ultimately it doesn't matter. Pick the course you will be happy to study for 3 years, and pick somewhere you will be happy to live. Think journey not destination.