The short answer if you haven't time to read the rest of my response here is to stick with Acrylic.
You are right to ask this question now because they are as different as cheese and chalk. Acrylic being the chalk, oil being the cheese. Acrylic dries too quickly, Oil doesn't dry quickly enough. Both can be frustrating until you get the hang of it.
You have to acknowledge that by developing very different techniques. Once you are proficient in one medium you will find it hard to switch to the other. Mastering technique takes a long time and when accomplished, you do a lot of things on 'auto pilot' without thinking. Switch and suddenly nothing works as it should.
Both media have the advantage of being able to overpaint your mistakes, so experimental learning is easier and quicker - especially with Acrylic. Remember it's only the same as emulsion house paint only slightly more refined. As someone has said it is much more manageable and less messy for being water soluble (until it's dry!) Oil can be a sticky nightmare and output is down awaiting drying time, which is why oil painters have several canvases in progress concurrently.
Lots of people start with watercolours because they seem less intimidating. There's an irony! Watercolour is the hardest medium to master because it relies on translucent washes often laid subtly over one another. Any error is sudden death and condemns your work to the bin. You can't overpaint watercolour mistakes, because if you try, that spontaneous freshness and wonderful control disappears and can never be re-captured.
Keep in mind you can use pure out of the tube Acrylic as watercolour by diluting it with water to apply translucent washes. Then if you make a mistake you can overpaint it completely by adding medium to make it fully opaque.
Good luck. Painting is wonderful for calming your nerves and fraying your temper depending on how it goes!