You must note that before you choose any Screaming Frog alternative, make sure it is compatible with your Operating System. Once that is checked, you can see if there is a trial period that is offered to you. This will help you to understand how to go about the functioning of the tool. A trial version will save you from paying a hefty amount and then realizing that this is not for you. Always choose the trial version first.
After you have more than two options to choose from, look at the pricing. That is when you can choose which is the best option that is out three for you.