It can be really hard knowing which PC diagnostic software is the best. Sometimes money can dictate your choice, but if you want to get good value for money, you may find that you have to pay a little more. On the other hand, you may get a good cheap deal. It can be really hard to know until you actually buy something. The best thing to do is probably to read some reviews and find out what other people think of what is available. You will also need to note down the requirements that you have so that you can check that the software will work for you.
If you do not have much budget and you cannot find something which does everything that you need, then it might be better to wait and save up for longer before you get any computer diagnostic tools because it will be a waste of money if you end up not using something because it does not do everything that you need it to. Think hard when buying something, even if it is with your companies money, because times are hard at the moment for everyone and reckless spending can cause big problems in the future and could be what caused the problems that we are all in now.