I haven't employed anyone, but I'd say if the only thing you need is to 'speed up' as OP says, employing someone is probably the way to go. If you're still feeling your way around finding traction then maybe a cofounder. But this is just my 2c.
I just wanted to see further discussion of co-founder vs. employee (#1). I tried to ask it in an enthusiastic way.
This is why I'm single, I guess. :)