Volt absorb is better.
For a few reasons. One is that you are immune to electric attacks and regain 25% of your health if you get hit by an electric attack.
Other reasons being that Quick feet requires you to be statused(burned, poisoned etc.), and on top of that Jolteon is already really fast and has no need for that.
Moveset:
Jolteon @ Choice Specs/Life Orb
Ability: Volt Absorb
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Thunderbolt
- Volt Switch
- Hidden Power [Ice]
- Signal Beam
Source: Experience
Hope I helped.