As a mini painter who later found oils, and has painted minis with oils and acrylics, there have been some great observations here. I have a lot more canvas experience than Mini xp, but I can say that for me drying time isn't that big of a deal. If you are using earth tones, especially, and are using some varnishes that increase drying time, your surface will be dry to touch in under an hour. Now, glaze something with some titanium white added and you may have a day to wait, but I am a slow acrylic painter anyway so even this doesn't matter for me.
The whole glossiness thing can be a big deal. Most dry with a satin finish, but here again there are ways around this.
Many wife cannot stand the smell of turpentine. Of course, you can use other thinners, but I prefer this. And then you need an oil based fattener. Though many mini painter just use their oil straight from the tube. Make sure the paints you use are "short" though, as long paints are just too dense and stringy for undiluted use.
Skin looks so much better in oils. Just compare some portraiture in both mediums. Oils are renowned for that "jewel-like" finish.
You our definitely know what you are getting from oil paints. No guessing between brands. In other words, if the paint colors don't have the same name, the elements used to manufacture the pigment are stated on the tube. Like all ivory black used to be made of charred animal bones. All good quality ultramarine is made from the same elements that make up lapis lazuli, except the latter is the purest quality mineral. Lapis goes for over $100 for a 47ml tube. Worth more than gold in its weight.
Regarding yellowing, this can be avoided by checking out the light fastness as well as doing a bit of research. Usually adding a drier will increase chances of yellowing. However, most yellowing takes many many decades to occur. Most.
BTW: Einion was an expert on oils that I've noticed from some pretty ancient posts on cmon as well as some traditional painting sites like Wetcanvas.com. However, he seems to he absentee since about 2011. Anyone know where he is nowadays?