This is something where many people say: "This is a matter of taste." I don't think so.
Which side you use outside does not only affect the look (which is really a matter of taste), but also the shape and then the appearance of the figure can differ quite from the desired result and you don't know why.
Unfortunately, there are a lot of websites and video tutorials that naturally turn the inside out without pointing out that the actual outside is the other (possibly even because they themselves do not know that it is not the front). I can't see how this misunderstanding can occur, because the side you look at (i.e. pointing to you) is the front, the side you don't see when crocheting (i.e. pointing backwards) is the back. That's pretty clear, isn't it?
Don't get me wrong, of course anyone can take the side to the outside that they like better, but I think it's bad that a lot of people think they're doing it right without realizing that it's not like that. Especially for beginners this often leads to problems and misunderstandings, because most patterns (all of mine) are written in such a way that the real front appears on the outside.
That's why I want to show you exactly how to recognize the front. If you look closely, the stitches on the front form a small "V", while on the back a small "knot" is formed in the fabric. For better understanding I marked what I mean on the photos.
Personally, I don't like the back so much, not to forget the fact that I don't think it would be so comfortable to crochet along the inside, as it quickly becomes fiddly and close, especially during the decreases.
As I said: everyone can choose which side to take outwards, as long as you are keep in mind that most (not all) patterns are designed in a way that the front comes outwards. Some patterns are specially made this way because the inside is a little smoother. I would just like to clarify, because really many of those who take the back to the outside think that this is the way it should be.
Have fun with our hobby together! :o)