Color AI computers now on the market include the two you mention, Oceanic VTX and Mares Icon, plus the Atomic Cobalt, and the Liquivision Lynx. I’m not sure if the Suunto Eon is yet available, but that might now be another, though expensive, option. Others, like SeaBear, have promised AI but don’t have it currently- this is a rapidly changing market. All of these manufacturers have forums in the ScubaBoard Manufacturer’s section, and you can get more opinions than you are likely to want looking at their sections. Just bear in mind that forums tend to attract those with problems, so all of these products are likely to perform better than it would seem from reading the posts. Most people like their dive computers.
What is important to you? Are you someone who studies manuals, or do you want something that is easy and intuitive to use? How important is battery life to you? Adding color screens, whether TFT or OLED, puts much higher demands on batteries and power management. How long do you want / need to be able to go without changing a battery or recharging? There is significant difference- Mares Support lists the Icon HD Net Ready as having 5-7 hours of dive time, and two weeks of standby, at the other end of the spectrum Atomic has 25-50 hours of dive time (depending on screen brightness) and six months of standby on a charge. The VTX, by reports, is somewhere in between but requires a physical battery change rather than just plugging the computer into a charger.
User changeable batteries that need to be swapped out (Oceanic, Liquivision) vs. batteries that can be charged in situ (Mares, Atomic) is a personal preference. My feeling is that every time you need to open up the computer there is another possibility for something to go wrong. There is quite a bit of variation in screen resolution among these color screens, with Mares and Atomic having the most pixels and the largest screen displays, Oceanic and Liquivision being smaller (also more compact) and lower resolution.
You should be aware that while color screens are wonderful to read in dim light, they have disadvantages topside in the tropics or in bright, shallow diving. In those circumstances emissive displays are never going to be as clear as the plain old LCD on your SOL.
A lot of this comes down to personal preference and diving style, what is important to one may not be important to another.
Hope your daughter loves diving as much as it sounds like she will- I think you are right to want to get her good equipment. Particularly for smaller women, getting gear that fits well can make all the difference in comfort and enjoyment.
Ron