For sertraline, what brand accord vs aurobindo

Ash
I've had some issues on sertraline. It messes with my stomach acid. I have to get pills for my stomach to counteract that. For convenience I went to a different chemist this month. And instead of the brand aurobindo it is the accord brand. The 100mg on Aurobindo have no side effects for me but the 50mg are HELL, they have side effect a plenty. I don't know why. I'm worried that the new brand is worse. 
Is there a difference? 
Are there some brands that a better quality and less side effects than others?