Ya, I know you came here to get help with choosing a computer. But before you go any further you need to decide what features you want it to have. If you want wireless AI, get one with wireless AI. If you don't want that feature find one that suits you. Figure out what you expect from the computer, what information you want it to give you. If you want a watch style, get it. If it has to have a digital compass find one that has a digital compass. I didn't care about a digital compass, I wanted wireless AI. I use a Datamask for my primary computer it serves me well. I can read it with no problems, it does nitrox and as a recreational diver it is exactly what I wanted. Not saying it is right for you just saying it works well for me and the diving I do. There are people who say that AI isn't necessary, in honesty it isn't unless you want it. A lot of people hate a digital compass and wouldn't buy a computer that has one, again in honesty it isn't necessary unless that is what you want.
So, research what features you want first, then find out what computer has those features and narrow down the choices. Figure out what your price range is that gives you the features you want and buy it. I made the mistake of buying a computer that wasn't what I wanted because I bought what everybody else told me what I wanted. After listening to everybody else, I finally bought what I wanted to begin with. I wasted some money getting there but I am now pleased with what I use.
So, research what features you want first, then find out what computer has those features and narrow down the choices. Figure out what your price range is that gives you the features you want and buy it. I made the mistake of buying a computer that wasn't what I wanted because I bought what everybody else told me what I wanted. After listening to everybody else, I finally bought what I wanted to begin with. I wasted some money getting there but I am now pleased with what I use.