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@Mikenetic
I can give some general pointers on the differences.
Silver needs a lower melting point, and has lower viscosity. As a result you're less likely to overheat the tubes and affect their material properties, and the silver will penetrate the joint more readily. This is important in situations where you may have only narrow gaps for the braze to flow by capillary action, for example a very close lug/tube tolerance. It's also used for stainless steel.
Brass needs a higher temperature to melt, and is somewhat more viscous. This controllability of flow is desirable for situations like fillet brazing, where you want to actually build up a quantity of braze. However, some steel alloys don't play nice at brass temps. It's also substantially cheaper than silver.
Used correctly, both materials should create joints stronger than the tubes themselves. When people learn the joints are destruction tested. A good joint won't fail at the join, the tube should buckle some distance away.