If leading-edge is not suitable for LED dimming, why do so many switches have it?
leading edge dimmer will cause repeated current surges into input capacitors on electronic ballasts. this will damage the ballast or the switch.
trailing edge dimmers will experience voltage spikes when they interrupt the circuit to inductive loads like iron ballasts and transformers possibly causing malfunction or damage.
What style of dimmer is right for your lamps depends on the lamps.