Prison or sanctuary?

So some friends of mine are putting in a good word for me at a company that I’ve wanted to work for since I moved here. As far as “jobs” go it would be about as good as they come. In fact it would be one of the jobs I have been actively pursuing. However, something dawned on me last night that is also kind of scary. If I did end up getting this job, I would not want to leave it. That sounds like a good thing, I’m sure, and it is in many ways. However that puts a scary angle on my acting/film crew/music work. If some opportunity arose, I would not leave my job to pursue it unless it was a proverbial “big break”. If I got some kind of offer for a month long PA job, acting job, music tour, etc., I couldn’t take it because I sure wouldn’t quit such a great job for a temporary gamble.
So this raises the question, “Which is more of a prison: a job you hate or a job you love?”
Now to be fair, I would still pursue it all to the best of my abilities and work around my job as much as I could, while also being far happier at my job and outside of it, but still it’s a scary prospect in some ways. Considering I haven’t even had an interview yet, I realize this is putting the cart before the horse, as it were, but I’m a ponderous guy.