I have to chime in to agree with everyone - one system is better. I had several before and all it did was confuse me (where did I capture that?) and you end up not trusting it. I kept creating additional systems to track the systems and it was a mess. One is always better.
That said, if you have to have two or more, each needs to have a specific purpose - business and personal, as an example. If you immediately know which one a task should go into, you are doing ok. And you will have to review both, of course.
I completely agree with Dena on software. I pick it based on how much I like to interact with it. If I like the design, I will be interacting with it. If it is boring, I will never open it again. Shiny objects, I know.