@KWcycling, @alexfthenakis pretty much nailed it. Sodium citrate is easier on your gut for long or hot sessions. For less challenging sessions, salt will work just fine.
Sodium citrate is easier on gut because:
- Fewer total ions per ion of sodium. Guts like lower osmolarity, but only a little impact here.
- Less chloride, period. Can be a bigger impact in long or hot riding where lots of sodium is necessary.