Ghost requires installation and tinkering (plugins, themes, etc). Silvrback is designed to give you something that looks great and doesn't take up your time. I believe that people shouldn't spend any time building a personal blog. You should spend that time on your products instead.

I could be wrong, but I think Silvrback probably has much better syntax highlighting than Ghost (do they have it at all?) and it gives you a bio page so you can consolidate your brand.

Ghost is also open source, much like a lot of blog software. Syntax highlighting is mostly irrelevant due to most platforms using 3rd party bundles like prettify,Syntaxhighlighter, etc.

I'll take having an open source, easy to install, fully controllable platform over closed any day of the week, especially for something simple like a blog platform, and blogs are not about products unless that is what you consider yourself.