In what way is it cleaner than Markdown?
[table]
[tr][th]Header 1;;Header 2;;Header 3[/th][/tr]
That looks like replicating HTML with additional complexity.
Markdown is good because it's simple and text-based. It has a simple syntax. Looking at Marksafe looks like you have to learn more syntax than Markdown and more than HTML.
I can see that additional syntax can make it more concise than HTML. But intuitively I wouldn't conciseness at the cost of additional complexity cleaner.