what do you like and good at?

What can you bring on the table makes you valuable. If you are not sure I suggest you take a second look at the offer.
Doing business with friends could be good or bad, it's your capability that makes you marketable at end.

To compare the two route, you can think of current job is like 15 year Bond with certain credit risk but most likely you get coupon payment with little upside. Your opportunity is like buying emerging market or high-tech stock which gives no or less dividends but provide the option on the upside. Just like any portfolio manager picking their holding, one need to determine the risk level you can tolerate in your portfolio.

2 cents.