When these different sources have different wordings/contradictory information, which trumps which? I imagine this is a question for @Morrus ? Or whoever's doing the SRD?
There are wording differences in rules, such as Dash:
A5e.tools: When you take the Dash action, you can use your action to move your speed (in addition to the movement you can make every turn).
SRD: When you take the Dash action, your speed is doubled for the current turn (after applying any modifiers). You can’t Dash if you’re suffering fatigue.
Twilight-touched Halflings, in the SRD they have 60ft darkvision but on a5e.tools & the AG they have 30ft. There's no errata changing it to 60ft.
The a5e.tools site specifies that Help requires being able to target an enemy with a melee attack, whereas AG says it only requires targeting with an attack- so Helping via ranged attack would work. There's no errata for that. The SRD has a different wording as well.
Names for features are different as well, for example the Adept has Focused Defense in SRD vs Patient Defense on Tools & AG.
There are wording differences in rules, such as Dash:
A5e.tools: When you take the Dash action, you can use your action to move your speed (in addition to the movement you can make every turn).
SRD: When you take the Dash action, your speed is doubled for the current turn (after applying any modifiers). You can’t Dash if you’re suffering fatigue.
Twilight-touched Halflings, in the SRD they have 60ft darkvision but on a5e.tools & the AG they have 30ft. There's no errata changing it to 60ft.
The a5e.tools site specifies that Help requires being able to target an enemy with a melee attack, whereas AG says it only requires targeting with an attack- so Helping via ranged attack would work. There's no errata for that. The SRD has a different wording as well.
Names for features are different as well, for example the Adept has Focused Defense in SRD vs Patient Defense on Tools & AG.