I'm extremely torn between the two. Both have good reasons to use them and good reasons not to, and I can't make up my mind, so I thought I'd lay them out here and get your opinions.

Flame Dash

Pros:

• Instant trigger, and works perfectly with large trigger range because it blinks to the target.

• Leaves a Damage over Time trail, which could be used to trigger Patient Reaper.

• Three Dragons interaction: initial hit shocks, ground burns. Could result in an exceptional bonus.

Cons:

• No AoE and the dash won't go past the target, so clearing groups could be frustrating.

Lightning Warp

Pros:

• Has an area of effect, making it much useful for clearing packs.

• Dual effect - more area is covered by a single trap.

• Can be boosted by area damage and AoE radius, unlike Flame Dash.

• Three Dragons interaction: Freezing enemies is always nice.

Cons:

• Delayed damage could make it very difficult to hit moving targets.

• The requirement for a reduced duration makes traps last a shorter time and demands additional support slots.

• No damage over time effect to trigger Patient Reaper, though this isn't mandatory.