I've taken both. I get on better with prevacid as prilosec stop me sleeping. Having said that there isn't a PPI that completely controls my reflux. I also take ranitidine and Gaviscon and I've also had surgery.
Things that have helped me include losing some weight, eating smaller meals, avoiding chocolate, alcohol and caffeine, and raising the head of my bed, oh and reducing stress.
I wouldn't bother with any "cure" remedies personally, save your money.