Regardless:
1. A $14m sale is a huuuge win. You'd be set for life. A 100% likelihood of $14m is something that is difficult to turn down in almost any scenario. Even if you'd eventually make $50m, your life wouldn't change much from a net worth of $14m to $50m. You could buy a nicer jet?
Let's say you take the $14m. Your life would (presumably) change drastically. That's "pay yourself $750k/yr without ever working again" level financial stability. (OK, some of it depends on taxes, but regardless...) If you raise VC, who knows what could happen in the next 5 years? IMO take it if you can.
2. If you want to go bigger, SV isn't the only way to do it. If you have revenue you could potentially raise debt. Hard to do, but perhaps worth it in your scenario.
3. If getting warm introductions is hard, just know that actually raising will be much harder.