I know that you didn't ask me Texas Ranger, but I think that both ProLINE and Golden Traingle products are equally fantastic.
I have also used both of their products too.
The only difference that I have noticed is that nearly everything that Golden Traingle makes comes in 10ml bottles and nearly everything that ProLINE makes comes in 20 ml bottles. That is the only real difference. The prices for each product are about the same too unit for unit.