I know there are vast choices when it comes to triggers, but besides the trigger does it matter?
It depends on the brand of the lower receiver. Some brands, like Colt, are proprietary and require specific parts kits. Other brands, like AR-15, are more universal and will work with most lower receivers.
When purchasing a parts kit for a rifle build, it’s important to be aware of the brand of lower receiver that will be used. If the lower receiver is not specified, then it’s best to go with a universal kit that will work with most brands. There are also many quality aftermarket parts kits available, so it’s worth exploring those options as well.