Electricians often use an 80% limit rule of thumb.
A 20A circuit operating at 80% would provide 16A safely.
Using your 14A kiln, that would give you a nice little 2A margin, which at 120V is about 240W to be used at any other outlet on that circuit.
The 15A circuit would already be operating at around 93% capacity and that is generally frowned upon from an electrical safety standpoint. Plus no real margin so any additional draw would likely pop that breaker. That means with a kiln on the circuit, all other outlets on that circuit would be effectively useless.
Best of luck!
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