Corey Goop cannot be beat as far as price/performance ratio.
I've used it on 4 boats, the oldest one being currently 6-years old.
It is indeed very tough and elastic (unlike all paints). No corals around where I live, but I have many scratches on the bottom - rocks on shallow rivers. No trace of delimination or any other degradation of the coating.
However, based on what I read, 7 to 8 years is about the extent of useful lifespan for typical Sof, so soon may need to reskin.
As far the difficulty to put the Goop on - it's not paint so you cannot slap it on with a brush. It has a consistency of thick olive oil - you spread it with a spatula.
Skinboats.org has good instructional videos how to do it.
Colean is supposedly the best, but very pricey. Good costs ~$60/boat, and considering how well it performs, it's a real bargain.
Last but not least, it's no-toxic. It's like a 2-part epoxy, so it emits hardly any volatile compounds - no need to use a mask while working with it. You almost need to stick your nose into it to smell it. It cures in about 1 day. You do the hull first day (3 coats), repeat the same for the deck next day.