Whatever system you use is mostly a matter of what you are used to.

I sailed always with a single sytem solo and the split system 2-up. After I got used to the split system solo, I much prefer it now.

There are 2 different lines to to pull, but there is less line. The biggest advantage is that you can do the hoiste and the dowse in stages, greatly improving your ability to keep control of the boat when things get bussy.