I used to use Raindance paste. The last few years I have used Meguire'sGold, and spray detailer. I use it because it is easy and works really well. There may be better products out there, but I haven't felt the need to try one of them yet.
So, what would get me to try something new? Well I tried Meguire's because I got a free sample of it at a car show. That is probably the best, and quickest way to get me to try a new product.